cPanel Forwarding to external servers not working
Hello everyone!
Writing here looking for some guidance.
Currently, I have a cPanel configure in a VPS I am able to connect to WHM. I've configured the DNS and I am able to send and receive emails. Issues started when I try to forwarding those emails to external SMTP (Gmail, Yahoo, iCloud).
I am able to get a copy of the email in the mailbox it is failing during the forwarding.
2025-02-06 01:40:37 1tfqsa-00000006qKo-3cCy ** external@gmail.com (mailbox@mydomain.ltd) <mailbox@mydomain.ltd> R=send_to_smart_host T=dkim_remote_smtp H=dedrelay.secureserver.net [132.148.124.49] X=TLS1.3:TLS_AES_256_GCM_SHA384:256 CV=yes: SMTP error from remote mail server after end of data: 550 5.2.0 fqsftLAhZh3yTfqsftO32d sender rejected. This relay isn't allowed to send mail "From" gmail.com
2025-02-06 01:40:38 1tfqsa-00000006qKo-3cCy Completed
Also, if I use the forwarders track delivery function, I am seeing that the external accounts have the message untraceable route to local delivery
According with this article https://docs.cpanel.net/cpanel/email/forwarders/
The folder icons should be a green globe indicating an external SMTP.
Email routing is set to Local Mail Exchanger.
I also activated SRS in Exim4, verified my DNS all the records are ok DMARC,SPF, DKIM
I am unable to reach the gmail SMTP server using any SMTP port 25, 465, 587
Also, tried to add a iptable rule to check connectivity, nothing work
# iptables -L -n
Chain INPUT (policy ACCEPT)
target prot opt source destination
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 25,465,587 owner GID match XXX
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 25,465,587 owner GID match XX
ACCEPT tcp -- 0.0.0.0/0 127.0.0.1 multiport dports 25,465,587 owner UID match XXX
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 multiport dports 25,465,587 owner UID match 0
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:25
Talking with my provider they found some bounce in the email logs, but I believe isn't related to the issue.
If I am missing something I hope you can guide me to the answer.
Thanks in advance.
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Hey there! Can you try enabling this option to see if that changes the behavior of the forwarded messages?
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Hi cPRex! Thanks for your reply!
As I mentioned, it’s already enabled, so I’m a bit stuck here.
I’m not sure what’s going wrong, but I’d appreciate any further guidance!
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Ah, sorry - I missed that line!
I'm not sure what else would make it think the messages are coming "from" somewhere else. Can you submit a ticket so this can be investigated?
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This is my first time posting here, how can I open a ticket?
Not sure I this something that helps but, I am using AlmaLinux 8, cPanel 120.0.22
This is the bounce email I got.
I am not 100% sure if the host name of the server could be and issue. Reporting-MTA: dns; XXX-XXX-XX-XX.cprapid.comThis 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(es) failed: external_user@gmail.com (ultimately generated from cpanel_user@mydomain.ltd) host dedrelay.secureserver.net [132.148.124.49] SMTP error from remote mail server after end of data: 550 5.2.0 g6gDtD2zaJ8IFg6gDtukPH <external_user@gmail.com> sender rejected. This relay isn't allowed to send mail "From" gmail.com --1738866769-eximdsn-1972168751 Content-type: message/delivery-status Reporting-MTA: dns; XXX-XXX-XX-XX.cprapid.com Action: failed Final-Recipient: rfc822;cpanel_user@mydoamin.ltd Status: 5.0.0 Remote-MTA: dns; dedrelay.secureserver.net Diagnostic-Code: smtp; 550 5.2.0 g6gDtD2zaJ8IFg6gDtukPH <external_user@gmail.com> sender rejected. This relay isn't allowed to send mail "From" gmail.comThanks again for your help.
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You can do that from WHM >> Create a Support Ticket. It will either direct you to us or your provider, depending on where your license was purchased.
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Thanks!
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My provider is GoDaddy, they're investigating, I will update the question if they can fix the issue.
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Sounds good!
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