Fetch messages whose IMAP reply lines exceed 8 KiB

Package.swift

@@ -4,7 +4,8 @@ import PackageDescription
 let package = Package(
     name: "Post",
     platforms: [
-        .macOS("14.0")
+        // SwiftMail's pinned swift-nio-imap declares macOS 15 (see below).
+        .macOS("15.0")
     ],
     products: [
         .library(
@@ -57,7 +58,15 @@ let package = Package(
         // 1.15.0 adds searchCount, which countMessages uses: it asks for COUNT, MIN
         // and MAX without the UID list, whose reply line for a large mailbox
         // exceeds swift-nio-imap's 8 KiB line limit.
-        .package(url: "https://github.com/Cocoanetics/SwiftMail", .upToNextMajor(from: "1.15.0")),
+        // Pinned by revision to SwiftMail 1.16.0 (#253), which removes that 8 KiB
+        // limit: it pins swift-nio-imap to main for apple/swift-nio-imap#849 and
+        // hands IMAPClientHandler its 1 MB responseBufferLimit. Before it, the
+        // BODYSTRUCTURE of a mail with 74 attachments was one reply line too long,
+        // so every list, search and fetch that touched the mail failed with
+        // PayloadTooLargeError. A revision-pinned dependency can't be resolved by
+        // version, so return to .upToNextMajor once swift-nio-imap tags a release
+        // with #849 and SwiftMail moves back to a version requirement.
+        .package(url: "https://github.com/Cocoanetics/SwiftMail", revision: "c3b7bc3a6b77509655668651c744934470fa2d86"),
         // 2.2.0 replaced the revision-pinned ZIPFoundation with tagged
         // swift-archive, so SwiftText is a normal version requirement again.
         // It declares swift-tools-version 6.3, which sets Post's toolchain

README.md

@@ -93,7 +93,7 @@ Combine IDLE with handler scripts to build a "mail room" that automatically sort
 ## Getting Started
 
 ### Requirements
-- macOS 14.0+
+- macOS 15.0+
 - Swift 6.3+ (Xcode 26.4+)
 
 ### Build & Run