Extract gmail transaction IDs, fixes #3224

changelog.md

@@ -9,6 +9,7 @@
 * Fix PHP 8.5 linting issue.
 * Don't use `-t` switch when calling qmail.
 * Checking for interrupted system calls now works in languages other than English.
+* Add support for extracting gmail transaction IDs after sending.
 
 ## Version 6.10.0 (April 24th, 2025)
 * Add support for [RFC 6530 SMTPUTF8](https://www.rfc-editor.org/rfc/rfc6530), permitting use of UTF-8 Unicode characters everywhere, thanks to @arnt and ICANN. See `SMTPUTF8.md` for details.

src/SMTP.php

@@ -205,6 +205,7 @@ class SMTP
         'Haraka' => '/[\d]{3} Message Queued \((.*)\)/',
         'ZoneMTA' => '/[\d]{3} Message queued as (.*)/',
         'Mailjet' => '/[\d]{3} OK queued as (.*)/',
+        'Gsmtp' => '/[\d]{3} 2\.0\.0 OK (.*) - gsmtp/',
     ];
 
     /**