Bug #80751 [PATCH]: Comma in recipient name breaks email delivery

Edit report at https://bugs.php.net/bug.php?id=80751&edit=1 ID: 80751 Patch added by: cmb@php.net Reported by: camaro396 at yandex dot ru Summary: Comma in recipient name breaks email delivery Status: Verified Type: Bug Package: Mail related Operating System: Windows Server 2012 R2 PHP Version: 7.4.15 Assigned To: cmb Block user comment: N Private report: N New Comment: The following pull request has been associated: Patch Name: Fix #80751: Comma in recipient name breaks email delivery On GitHub: https://github.com/php/php-src/pull/6735 Patch: https://github.com/php/php-src/pull/6735.patch Previous Comments: ------------------------------------------------------------------------ [2021-02-15 09:34:39] cmb@php.net The problem is on our side. SendText() splits the recipients on comma[1], regardless of whether the comma is inside a quoted string, or not. [1] <https://github.com/php/php-src/blob/php-7.4.15/win32/sendmail.c#L412-L413> ------------------------------------------------------------------------ [2021-02-14 21:19:59] requinix@php.net What is the remote mail server software? The transcript suggests that it isn't parsing "Lastname, firstname" correctly as a quoted string. ------------------------------------------------------------------------ [2021-02-14 15:10:01] camaro396 at yandex dot ru Description: ------------ Comma in recipient name leads to a malformed SMTP FROM command. Test script: --------------- mail('"Lastname, firstname" <lastname_firstname@example.com>', 'TEST', 'TEST', 'From: "Test" <test@example.com>'); Expected result: ---------------- Message sent successfully Actual result: -------------- Message not sent. SMTP transcript looks like this "SMTPD" 55224 293364 "2021-02-04 05:34:12.678" "xx.xx.xx.xx" "SENT: 220 mx.example.com" "SMTPD" 56232 293364 "2021-02-04 05:34:12.678" "xx.xx.xx.xx" "RECEIVED: HELO HOSTNAME" "SMTPD" 56232 293364 "2021-02-04 05:34:12.678" "xx.xx.xx.xx" "SENT: 250 Hello." "SMTPD" 55224 293364 "2021-02-04 05:34:12.678" "xx.xx.xx.xx" "RECEIVED: MAIL FROM:<sender@example.com>" "SMTPD" 55224 293364 "2021-02-04 05:34:12.678" "xx.xx.xx.xx" "SENT: 250 OK" "SMTPD" 55224 293364 "2021-02-04 05:34:12.678" "xx.xx.xx.xx" "RECEIVED: RCPT TO:<"Lastname>" "SMTPD" 55224 293364 "2021-02-04 05:34:12.678" "xx.xx.xx.xx" "SENT: 550 A valid address is required." "SMTPD" 55224 293364 "2021-02-04 05:34:12.678" "xx.xx.xx.xx" "RECEIVED: QUIT" "SMTPD" 55224 293364 "2021-02-04 05:34:12.678" "xx.xx.xx.xx" "SENT: 221 goodbye" ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=80751&edit=1