XF 2.3 Mail Delivery Failed

[articulatedthoughts]

I installed XenForo yesterday and already love it. I'm new to self-hosting and webmastering, so I apologize if this question is rudimentary. I looked this up and couldn't find anything to help.

I had an influx of new users yesterday migrating from another site. About half of them received the email confirmation notices and the rest did not. Because I was importing a lot of new users, I turned off the email confirmation requirement. I checked my ACP and found that server errors were logged, but assumed the issue was with their email clients. Today, I received another few hundred server errors, all related to failed email delivery. It's not just confirmation emails, but most/all emails.

XF Server Error Log

Symfony\Component\Mailer\Exception\TransportException: Email to [x]@gmail.com from [x]@articulatedthoughts.com failed: Process failed with exit code 69: sendmail: recipient address [x]@gmail.com not accepted by the server sendmail: server message: 450-Requested mail action not taken: mailbox unavailable sendmail: server message: 450-Mail send limit exceeded. sendmail: server message: 450 1MYusu-1teKeU1emu-00YfDJ sendmail: could not send mail (account default from /homepages/config/smtp/msmtprc.ws67394880) src/vendor/symfony/mailer/Transport/Smtp/Stream/ProcessStream.php:74

Generated by: Unknown account Apr 3, 2025 at 2:23 PM

Stack trace​

#0 src/vendor/symfony/mailer/Transport/SendmailTransport.php(120): Symfony\Component\Mailer\Transport\Smtp\Stream\ProcessStream->terminate()
#1 src/vendor/symfony/mailer/Transport/AbstractTransport.php(72): Symfony\Component\Mailer\Transport\SendmailTransport->doSend(Object(Symfony\Component\Mailer\SentMessage))
#2 src/vendor/symfony/mailer/Transport/SendmailTransport.php(78): Symfony\Component\Mailer\Transport\AbstractTransport->send(Object(Symfony\Component\Mailer\SentMessage), Object(Symfony\Component\Mailer\DelayedEnvelope))
#3 src/XF/Mail/Mailer.php(305): Symfony\Component\Mailer\Transport\SendmailTransport->send(Object(Symfony\Component\Mime\Email))
#4 src/XF/Job/MailSend.php(37): XF\Mail\Mailer->send(Object(Symfony\Component\Mime\Email))
#5 src/XF/Job/Manager.php(275): XF\Job\MailSend->run(7.78161)
#6 src/XF/Job/Manager.php(205): XF\Job\Manager->runJobInternal(Array, 7.78161)
#7 src/XF/Job/Manager.php(89): XF\Job\Manager->runJobEntry(Array, 7.78161)
#8 job.php(46): XF\Job\Manager->runQueue(false, 8)
#9 {main}

Request state​

array(4) {
["url"] => string(8) "/job.php"
["referrer"] => string(41) "https://articulatedthoughts.com/index.php"
["_GET"] => array(0) {
}
["_POST"] => array(0) {
}
}

I checked my server email account and found that it had also been flooded with Mail Delivery Failed emails. Most of them are from Gmail accounts. I'm assuming this is because of the SPF or D KIM authentication.

Server Email Error - Gmail

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of
its recipients. This is a permanent error.

The following address failed:

[x]@gmail.com:
SMTP error from remote server for TEXT command, host: gmail-smtp-in.l.google.com (142.250.112.27) reason: 550-5.7.26 Your email has been blocked because the sender is unauthenticat
ed.
550-5.7.26 Gmail requires all senders to authenticate with either SPF or D
KIM.
550-5.7.26
550-5.7.26 Authentication results:
550-5.7.26 DKIM = did not pass
550-5.7.26 SPF [articulatedthoughts.com] with ip: [x] = did no
t pass
550-5.7.26
550-5.7.26 For instructions on setting up authentication, go to
550 5.7.26 https://support.google.com/mail/answer/81126#authentication 6a
1803df08f44-6ef0f1244f4si20486236d6.303 - gsmtp


--- The header of the original message is following. ---

Received: from localhost ([66.175.237.25]) by mrelay.perfora.net (mreueus003
[74.208.5.2]) with ESMTPSA (Nemesis) id 0MPW1n-1u4awV0Wll-00Gmvv for
<[x]@gmail.com>; Fri, 04 Apr 2025 01:42:34 +0200
From: Articulated Thoughts <[x]@articulatedthoughts.com>
Return-Path: <[x]@articulatedthoughts.com>
To: Resilient <[x]@gmail.com>
X-To-Validate: 72fdb84a+[x]@gmail.com
Subject: 2025 Rumor/Leak List - New reply to watched thread
Auto-Submitted: auto-generated
List-Unsubscribe: <https://articulatedthoughts.com/ind...nsubscribe&c=fbffa0d995a086b058980ed9a5788635>
List-Unsubscribe-Post: List-Unsubscribe=One-Click
Message-ID: <b5626c6230de7cba029ae6c66c33e119@articulatedthoughts.com>
MIME-Version: 1.0
Date: Thu, 03 Apr 2025 23:42:33 +0000
Content-Type: multipart/alternative; boundary=cGt5LncI
X-Provags-ID: V03:K1:y5RN6D6k8zjif1TCpE55KY43kyxtf1kB/TzRtqBlO8MN10GCPJR
FjVHKkfweFX0B7m6jl6vF4pK0BTS4AFsMMGKlenNR1SI6QKld8MeOoVTGnigDDd3+6R8WX2
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GvMrxynch5/ddEM09wNNg==
X-Spam-Flag: NO
UI-OutboundReport: notjunk:1;M010:95NnLQJcLes=;B8Wr5MYZrTH/p7zg6/9F5MBcJd7
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RKB4VR+XQVCd34EV9Pp3vEvusc7+DJGGAca2Fs2c4n2J2ndrjM5GrtLHAygBbZYIc/iVAIpYU
1URKa5zuG3C7RPZo5o+FRcA3OM2WOk42y/mh2RWtJK6REH8Sk7HezOAFh53JncknpwDDIaH1Q
WOIM933lf4ghMoD+/fDV0aut5WjXA7y/MH/mw=

However, I also have delivery failures from Hotmail, Yahoo, and others.

Server Email Error - Hotmail

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of
its recipients. This is a permanent error.

The following address failed:

[x]@hotmail.com:
SMTP error from remote server for RCPT TO command, host: hotmail-com.olc.protection.outlook.com (52.101.40.30) reason: 550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302). [
CY4PEPF0000FCC1.namprd03.prod.outlook.com 2025-04-02T19:21:06.012Z 08D
D700F7A18388E]


--- The header of the original message is following. ---

Received: from localhost ([66.175.237.25]) by mrelay.perfora.net (mreueus002
[74.208.5.2]) with ESMTPSA (Nemesis) id 0MA82J-1tooIa1oE5-004GlM for
<[x]@hotmail.com>; Wed, 02 Apr 2025 21:21:05 +0200
From: Articulated Thoughts <[x]@articulatedthoughts.com>
Return-Path: <[x]@articulatedthoughts.com>
To: Chooch555 <[x]@hotmail.com>
X-To-Validate: 31970058+[x]@hotmail.com
Subject: Articulated Thoughts - Account confirmation required
Auto-Submitted: auto-generated
Message-ID: <4c85c3b2fbfe01c00b9feb49e1d90a4a@articulatedthoughts.com>
MIME-Version: 1.0
Date: Wed, 02 Apr 2025 19:21:05 +0000
Content-Type: multipart/alternative; boundary=HG-9oka_
X-Provags-ID: V03:K1:52+6OYTCrIfOB3pe9A6GR6KQUV4KUcylNhu0PUfnQtSpLeceSTu
/+N63yk0zAeyur/RziM6ikWVRjM+lH3Wl2OglH+XauURO6ZRPe8CWGigdN76fECcBGRarRp
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31uFUuSpnWcRhtEWLlfgA==
X-Spam-Flag: NO
UI-OutboundReport: notjunk:1;M010:hGPRFmRh2S4=;LdvWqjQbN79y9/+NckdwTaC1adr
kqXEed6St/WU7ulGlD5ahLEQ1x3qv2ZlzyDi0TpyzvJ7JRe2NhD1zeEUtBkhHm/JXwBDoJrDK
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EIj3+nFXz6Grc48dORAWR0KZqEETJGSAfESsVoQwomPARaPQ9g9Gmy3pq8

Any help is greatly appreciated!

 

[philmckrackon]

What OS?
Are using any WHM or cPanel?

 

[articulatedthoughts]

What OS?
Are using any WHM or cPanel?

Windows and WHM.

 

[ENF]

Windows and WHM.

The issue you're having isn't related to the OS/Platform, it's strictly related to how your email system is configured. At this point, it's generally recommended to use a 3rd mailing solution like Amazon SES. You definitely need to have SPF, DKIM and DMARC configured correctly to have any hope of getting email delivered. Using a service that specializes in mail handling will save you a lot of headaches.

The errors you presented above represent a misconfiguration or lack thereof when it comes to your outgoing email handling.