diff --git a/CHANGELOG.md b/CHANGELOG.md
index e4b111ff..e679223d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,7 +8,7 @@ All notable changes to this project will be documented in this file. This projec
 To upgrade replace the `stalwart-mail` binary and then upgrade to the latest web-admin version.
 
 ## Added
-- Support for DNS-01 and HTTP-01 ACME challenges (#226)
+- Support for `DNS-01` and `HTTP-01` ACME challenges (#226)
 - Configurable external resources (#355)
 
 ### Changed
diff --git a/Cargo.lock b/Cargo.lock
index a4f55a98..8f9813c8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -268,7 +268,7 @@ checksum = "7378575ff571966e99a744addeff0bff98b8ada0dedf1956d59e634db95eaac1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
  "synstructure 0.13.1",
 ]
 
@@ -291,7 +291,7 @@ checksum = "7b18050c2cd6fe86c3a76584ef5e0baf286d038cda203eb6223df2cc413565f7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -315,7 +315,7 @@ checksum = "30c5ef0ede93efbf733c1a727f3b6b5a1060bbedd5600183e66f6e4be4af0ec5"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -337,7 +337,7 @@ checksum = "16e62a023e7c117e27523144c5d2459f4397fcc3cab0085af8e2224f643a0193"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -348,7 +348,7 @@ checksum = "c6fa2087f2753a7da8cc1c0dbfcf89579dd57458e36769de5ac750b4671737ca"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -536,7 +536,7 @@ dependencies = [
  "regex",
  "rustc-hash",
  "shlex",
- "syn 2.0.58",
+ "syn 2.0.60",
  "which",
 ]
 
@@ -679,7 +679,7 @@ dependencies = [
  "proc-macro-crate",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
  "syn_derive",
 ]
 
@@ -799,9 +799,9 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.0.92"
+version = "1.0.94"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2678b2e3449475e95b0aa6f9b506a28e61b3dc8996592b983695e8ebb58a8b41"
+checksum = "17f6e324229dc011159fcc089755d1e2e216a90d43a7dea6853ca740b84f35e7"
 dependencies = [
  "jobserver",
  "libc",
@@ -859,9 +859,9 @@ checksum = "fd16c4719339c4530435d38e511904438d07cce7950afa3718a84ac36c10e89e"
 
 [[package]]
 name = "chrono"
-version = "0.4.37"
+version = "0.4.38"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a0d04d43504c61aa6c7531f1871dd0d418d91130162063b789da00fd7057a5e"
+checksum = "a21f936df1771bf62b77f047b726c4625ff2e8aa607c01ec06e5a05bd8463401"
 dependencies = [
  "android-tzdata",
  "iana-time-zone",
@@ -869,7 +869,7 @@ dependencies = [
  "num-traits",
  "serde",
  "wasm-bindgen",
- "windows-targets 0.52.4",
+ "windows-targets 0.52.5",
 ]
 
 [[package]]
@@ -934,7 +934,7 @@ dependencies = [
  "heck 0.5.0",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -997,7 +997,7 @@ dependencies = [
  "dns-update",
  "futures",
  "hostname 0.4.0",
- "hyper 1.2.0",
+ "hyper 1.3.1",
  "idna 0.5.0",
  "imagesize",
  "infer",
@@ -1271,7 +1271,7 @@ checksum = "f46882e17999c6cc590af592290432be3bce0428cb0d5f8b6715e4dc7b383eb3"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -1319,7 +1319,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "strsim 0.10.0",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -1341,7 +1341,7 @@ checksum = "a668eda54683121533a393014d8692171709ff57a7d61f187b6e782719f8933f"
 dependencies = [
  "darling_core 0.20.8",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -1579,7 +1579,7 @@ checksum = "487585f4d0c6655fe74905e2504d8ad6908e4db67f744eb140876906c2f3175d"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -1590,9 +1590,9 @@ checksum = "0688c2a7f92e427f44895cd63841bff7b29f8d7a1648b9e7e07a4a365b2e1257"
 
 [[package]]
 name = "dns-update"
-version = "0.1.1"
+version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1be40017dbee3b3cb51abd068fd8319d83b95433cca53d83fef589a11ba0cd51"
+checksum = "14b0a9ca156a0285b2768b7fcb368b231e7736d3c13eef604c5c4203057bed33"
 dependencies = [
  "hickory-client",
  "reqwest 0.12.3",
@@ -1711,9 +1711,9 @@ dependencies = [
 
 [[package]]
 name = "either"
-version = "1.10.0"
+version = "1.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "11157ac094ffbdde99aa67b23417ebdd801842852b500e395a45a9c0aac03e4a"
+checksum = "a47c1c47d2f5964e29c61246e81db715514cd532db6b5116a25ea3c03d6780a2"
 
 [[package]]
 name = "elasticsearch"
@@ -1801,7 +1801,7 @@ dependencies = [
  "heck 0.4.1",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -1984,7 +1984,7 @@ checksum = "f8db6653cbc621a3810d95d55bd342be3e71181d6df21a4eb29ef986202d3f9c"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
  "try_map",
 ]
 
@@ -2023,7 +2023,7 @@ checksum = "b0fa992f1656e1707946bbba340ad244f0814009ef8c0118eb7b658395f19a2e"
 dependencies = [
  "frunk_proc_macro_helpers",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -2035,7 +2035,7 @@ dependencies = [
  "frunk_core",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -2047,7 +2047,7 @@ dependencies = [
  "frunk_core",
  "frunk_proc_macro_helpers",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -2112,7 +2112,7 @@ checksum = "87750cf4b7a4c0625b1529e4c543c2182106e4dedc60a2a6455e00d212c489ac"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -2553,9 +2553,9 @@ dependencies = [
 
 [[package]]
 name = "hyper"
-version = "1.2.0"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "186548d73ac615b32a73aafe38fb4f56c0d340e110e5a200bcadbaf2e199263a"
+checksum = "fe575dd17d0862a9a33781c8c4696a55c320909004a67a00fb286ba8b1bc496d"
 dependencies = [
  "bytes",
  "futures-channel",
@@ -2594,7 +2594,7 @@ checksum = "a0bea761b46ae2b24eb4aef630d8d1c398157b6fc29e6350ecf090a0b70c952c"
 dependencies = [
  "futures-util",
  "http 1.1.0",
- "hyper 1.2.0",
+ "hyper 1.3.1",
  "hyper-util",
  "rustls 0.22.3",
  "rustls-pki-types",
@@ -2626,7 +2626,7 @@ dependencies = [
  "futures-util",
  "http 1.1.0",
  "http-body 1.0.0",
- "hyper 1.2.0",
+ "hyper 1.3.1",
  "pin-project-lite",
  "socket2",
  "tokio",
@@ -2917,7 +2917,7 @@ dependencies = [
  "futures-util",
  "hkdf",
  "http-body-util",
- "hyper 1.2.0",
+ "hyper 1.3.1",
  "hyper-util",
  "jmap_proto",
  "lz4_flex",
@@ -2991,9 +2991,9 @@ dependencies = [
 
 [[package]]
 name = "jobserver"
-version = "0.1.29"
+version = "0.1.30"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f08474e32172238f2827bd160c67871cdb2801430f65c3979184dc362e3ca118"
+checksum = "685a7d121ee3f65ae4fddd72b25a04bb36b6af81bc0828f7d5434c0fe60fa3a2"
 dependencies = [
  "libc",
 ]
@@ -3018,9 +3018,9 @@ dependencies = [
 
 [[package]]
 name = "konst"
-version = "0.3.8"
+version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8d712a8c49d4274f8d8a5cf61368cb5f3c143d149882b1a2918129e53395fdb0"
+checksum = "50a0ba6de5f7af397afff922f22c149ff605c766cd3269cf6c1cd5e466dbe3b9"
 dependencies = [
  "const_panic",
  "konst_kernel",
@@ -3029,9 +3029,9 @@ dependencies = [
 
 [[package]]
 name = "konst_kernel"
-version = "0.3.8"
+version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dac6ea8c376b6e208a81cf39b8e82bebf49652454d98a4829e907dac16ef1790"
+checksum = "be0a455a1719220fd6adf756088e1c69a85bf14b6a9e24537a5cc04f503edb2b"
 dependencies = [
  "typewit",
 ]
@@ -3131,7 +3131,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0c2a198fb6b0eada2a8df47933734e6d35d350665a33a3593d7164fa52c75c19"
 dependencies = [
  "cfg-if",
- "windows-targets 0.52.4",
+ "windows-targets 0.52.5",
 ]
 
 [[package]]
@@ -3388,7 +3388,7 @@ checksum = "5cf92c10c7e361d6b99666ec1c6f9805b0bea2c3bd8c78dc6fe98ac5bd78db11"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -3495,7 +3495,7 @@ dependencies = [
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
  "termcolor",
  "thiserror",
 ]
@@ -3795,7 +3795,7 @@ checksum = "a948666b637a0f465e8564c73e89d4dde00d72d4d473cc972f390fc3dcee7d9c"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -4092,7 +4092,7 @@ dependencies = [
  "phf_shared 0.11.2",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -4130,7 +4130,7 @@ checksum = "2f38a4412a78282e09a2cf38d195ea5420d15ba0602cb375210efbc877243965"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -4245,12 +4245,12 @@ checksum = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
 
 [[package]]
 name = "prettyplease"
-version = "0.2.17"
+version = "0.2.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8d3928fb5db768cb86f891ff014f0144589297e3c6a1aba6ed7cecfdace270c7"
+checksum = "5ac2cf0f2e4f42b49f5ffd07dae8d746508ef7526c13940e5f524012ae6c6550"
 dependencies = [
  "proc-macro2",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -4321,9 +4321,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.79"
+version = "1.0.81"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e835ff2298f5721608eb1a980ecaee1aef2c132bf95ecc026a11b7bf3c01c02e"
+checksum = "3d1597b0c024618f09a9c3b8655b7e430397a36d23fdafec26d6965e9eec3eba"
 dependencies = [
  "unicode-ident",
 ]
@@ -4348,7 +4348,7 @@ dependencies = [
  "itertools 0.12.1",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -4751,7 +4751,7 @@ dependencies = [
  "http 1.1.0",
  "http-body 1.0.0",
  "http-body-util",
- "hyper 1.2.0",
+ "hyper 1.3.1",
  "hyper-rustls 0.26.0",
  "hyper-util",
  "ipnet",
@@ -5383,9 +5383,9 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.197"
+version = "1.0.198"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3fb1c873e1b9b056a4dc4c0c198b24c3ffa059243875552b2bd0933b1aee4ce2"
+checksum = "9846a40c979031340571da2545a4e5b7c4163bdae79b301d5f86d03979451fcc"
 dependencies = [
  "serde_derive",
 ]
@@ -5401,13 +5401,13 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.197"
+version = "1.0.198"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7eb0b34b42edc17f6b7cac84a52a1c5f0e1bb2227e997ca9011ea3dd34e8610b"
+checksum = "e88edab869b01783ba905e7d0153f9fc1a6505a96e4ad3018011eedb838566d9"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -5477,7 +5477,7 @@ checksum = "b93fb4adc70021ac1b47f7d45e8cc4169baaa7ea58483bc5b721d19a26202212"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -5640,7 +5640,7 @@ dependencies = [
  "directory",
  "form_urlencoded",
  "http-body-util",
- "hyper 1.2.0",
+ "hyper 1.3.1",
  "hyper-util",
  "idna 0.5.0",
  "imagesize",
@@ -5885,9 +5885,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.58"
+version = "2.0.60"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44cfb93f38070beee36b3fef7d4f5a16f27751d94b187b666a5cc5e9b0d30687"
+checksum = "909518bc7b1c9b779f1bbf07f2929d35af9f0f37e47c6e9ef7f9dddc1e1821f3"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -5903,7 +5903,7 @@ dependencies = [
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -5932,7 +5932,7 @@ checksum = "c8af7666ab7b6390ab78131fb5b0fce11d6b7a6951602017c35fa82800708971"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -5999,7 +5999,7 @@ dependencies = [
  "flate2",
  "futures",
  "http-body-util",
- "hyper 1.2.0",
+ "hyper 1.3.1",
  "hyper-util",
  "imap",
  "imap_proto",
@@ -6049,7 +6049,7 @@ checksum = "c61f3ba182994efc43764a46c018c347bc492c79f024e705f46567b418f6d4f7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -6164,7 +6164,7 @@ checksum = "5b8a1e28f2deaa14e508979454cb3a223b10b938b45af148bc0986de36f1923b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -6363,7 +6363,7 @@ checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -6739,7 +6739,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
  "wasm-bindgen-shared",
 ]
 
@@ -6773,7 +6773,7 @@ checksum = "e94f17b526d0a461a191c78ea52bbce64071ed5c04c9ffe424dcb38f74171bb7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -6928,7 +6928,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e48a53791691ab099e5e2ad123536d0fff50652600abaf43bbf952894110d0be"
 dependencies = [
  "windows-core",
- "windows-targets 0.52.4",
+ "windows-targets 0.52.5",
 ]
 
 [[package]]
@@ -6937,7 +6937,7 @@ version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "33ab640c8d7e35bf8ba19b884ba838ceb4fba93a4e8c65a9059d08afcfc683d9"
 dependencies = [
- "windows-targets 0.52.4",
+ "windows-targets 0.52.5",
 ]
 
 [[package]]
@@ -6955,7 +6955,7 @@ version = "0.52.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
 dependencies = [
- "windows-targets 0.52.4",
+ "windows-targets 0.52.5",
 ]
 
 [[package]]
@@ -6975,17 +6975,18 @@ dependencies = [
 
 [[package]]
 name = "windows-targets"
-version = "0.52.4"
+version = "0.52.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7dd37b7e5ab9018759f893a1952c9420d060016fc19a472b4bb20d1bdd694d1b"
+checksum = "6f0713a46559409d202e70e28227288446bf7841d3211583a4b53e3f6d96e7eb"
 dependencies = [
- "windows_aarch64_gnullvm 0.52.4",
- "windows_aarch64_msvc 0.52.4",
- "windows_i686_gnu 0.52.4",
- "windows_i686_msvc 0.52.4",
- "windows_x86_64_gnu 0.52.4",
- "windows_x86_64_gnullvm 0.52.4",
- "windows_x86_64_msvc 0.52.4",
+ "windows_aarch64_gnullvm 0.52.5",
+ "windows_aarch64_msvc 0.52.5",
+ "windows_i686_gnu 0.52.5",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc 0.52.5",
+ "windows_x86_64_gnu 0.52.5",
+ "windows_x86_64_gnullvm 0.52.5",
+ "windows_x86_64_msvc 0.52.5",
 ]
 
 [[package]]
@@ -6996,9 +6997,9 @@ checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
 
 [[package]]
 name = "windows_aarch64_gnullvm"
-version = "0.52.4"
+version = "0.52.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bcf46cf4c365c6f2d1cc93ce535f2c8b244591df96ceee75d8e83deb70a9cac9"
+checksum = "7088eed71e8b8dda258ecc8bac5fb1153c5cffaf2578fc8ff5d61e23578d3263"
 
 [[package]]
 name = "windows_aarch64_msvc"
@@ -7008,9 +7009,9 @@ checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
 
 [[package]]
 name = "windows_aarch64_msvc"
-version = "0.52.4"
+version = "0.52.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "da9f259dd3bcf6990b55bffd094c4f7235817ba4ceebde8e6d11cd0c5633b675"
+checksum = "9985fd1504e250c615ca5f281c3f7a6da76213ebd5ccc9561496568a2752afb6"
 
 [[package]]
 name = "windows_i686_gnu"
@@ -7020,9 +7021,15 @@ checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
 
 [[package]]
 name = "windows_i686_gnu"
-version = "0.52.4"
+version = "0.52.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b474d8268f99e0995f25b9f095bc7434632601028cf86590aea5c8a5cb7801d3"
+checksum = "88ba073cf16d5372720ec942a8ccbf61626074c6d4dd2e745299726ce8b89670"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87f4261229030a858f36b459e748ae97545d6f1ec60e5e0d6a3d32e0dc232ee9"
 
 [[package]]
 name = "windows_i686_msvc"
@@ -7032,9 +7039,9 @@ checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
 
 [[package]]
 name = "windows_i686_msvc"
-version = "0.52.4"
+version = "0.52.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1515e9a29e5bed743cb4415a9ecf5dfca648ce85ee42e15873c3cd8610ff8e02"
+checksum = "db3c2bf3d13d5b658be73463284eaf12830ac9a26a90c717b7f771dfe97487bf"
 
 [[package]]
 name = "windows_x86_64_gnu"
@@ -7044,9 +7051,9 @@ checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
 
 [[package]]
 name = "windows_x86_64_gnu"
-version = "0.52.4"
+version = "0.52.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5eee091590e89cc02ad514ffe3ead9eb6b660aedca2183455434b93546371a03"
+checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
@@ -7056,9 +7063,9 @@ checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
-version = "0.52.4"
+version = "0.52.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "77ca79f2451b49fa9e2af39f0747fe999fcda4f5e241b2898624dca97a1f2177"
+checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
 
 [[package]]
 name = "windows_x86_64_msvc"
@@ -7068,9 +7075,9 @@ checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
 
 [[package]]
 name = "windows_x86_64_msvc"
-version = "0.52.4"
+version = "0.52.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32b752e52a2da0ddfbdbcc6fceadfeede4c939ed16d13e648833a61dfb611ed8"
+checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
 
 [[package]]
 name = "winnow"
@@ -7193,7 +7200,7 @@ checksum = "9ce1b18ccd8e73a9321186f97e46f9f04b778851177567b1975109d26a08d2a6"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
@@ -7213,7 +7220,7 @@ checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn 2.0.60",
 ]
 
 [[package]]
diff --git a/crates/common/src/config/server/tls.rs b/crates/common/src/config/server/tls.rs
index 414fcc16..9605316c 100644
--- a/crates/common/src/config/server/tls.rs
+++ b/crates/common/src/config/server/tls.rs
@@ -23,7 +23,7 @@
 
 use std::{
     io::Cursor,
-    net::{Ipv4Addr, Ipv6Addr},
+    net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr},
     sync::Arc,
     time::Duration,
 };
@@ -31,7 +31,7 @@ use std::{
 use ahash::{AHashMap, AHashSet};
 use arc_swap::ArcSwap;
 use base64::{engine::general_purpose::STANDARD, Engine};
-use dns_update::{DnsUpdater, TsigAlgorithm};
+use dns_update::{providers::rfc2136::DnsAddress, DnsUpdater, TsigAlgorithm};
 use rcgen::generate_simple_self_signed;
 use rustls::{
     crypto::ring::sign::any_supported_type,
@@ -218,18 +218,18 @@ fn build_dns_updater(config: &mut Config, acme_id: &str) -> Option<DnsUpdater> {
                     )
                 })
                 .ok()?;
-            let host = config.value_require(("acme", acme_id, "host"))?.to_string();
+            let host = config.property_require::<IpAddr>(("acme", acme_id, "host"))?;
             let port = config
                 .property_or_default::<u16>(("acme", acme_id, "port"), "53")
                 .unwrap_or(53);
-            let protocol = if config.value(("acme", acme_id, "protocol")) == Some("tcp") {
-                "tcp"
+            let addr = if config.value(("acme", acme_id, "protocol")) == Some("tcp") {
+                DnsAddress::Tcp(SocketAddr::new(host, port))
             } else {
-                "udp"
+                DnsAddress::Udp(SocketAddr::new(host, port))
             };
 
             DnsUpdater::new_rfc2136_tsig(
-                format!("{protocol}://{host}:{port}"),
+                addr,
                 config.value_require(("acme", acme_id, "key"))?.to_string(),
                 key,
                 algorithm,
diff --git a/crates/common/src/config/smtp/resolver.rs b/crates/common/src/config/smtp/resolver.rs
index 9e76058c..86314825 100644
--- a/crates/common/src/config/smtp/resolver.rs
+++ b/crates/common/src/config/smtp/resolver.rs
@@ -113,21 +113,33 @@ impl Resolvers {
                     } else {
                         (Protocol::Udp, url)
                     };
-                    let (host, port) = if let Some((host, port)) = host.split_once(':') {
+
+                    let (host, port) = if let Some(host) = host.strip_prefix('[') {
+                        let (host, maybe_port) = host.rsplit_once(']').unwrap_or_default();
+
                         (
-                            host.to_string(),
-                            port.parse::<u16>()
-                                .map_err(|err| {
-                                    config.new_parse_error(
-                                        "resolver.custom",
-                                        format!("Invalid custom resolver port {port:?}: {err}"),
-                                    );
-                                })
-                                .unwrap_or(53),
+                            host,
+                            maybe_port
+                                .rsplit_once(':')
+                                .map(|(_, port)| port)
+                                .unwrap_or("53"),
                         )
+                    } else if let Some((host, port)) = host.split_once(':') {
+                        (host, port)
                     } else {
-                        (host, 53)
+                        (host.as_str(), "53")
                     };
+
+                    let port = port
+                        .parse::<u16>()
+                        .map_err(|err| {
+                            config.new_parse_error(
+                                "resolver.custom",
+                                format!("Invalid custom resolver port {port:?}: {err}"),
+                            );
+                        })
+                        .unwrap_or(53);
+
                     let host = host
                         .parse::<IpAddr>()
                         .map_err(|err| {