I am experiencing an issue where, after installing Carbonio, I am unable to send emails to Gmail domains. However, sending emails to other external addresses works without any problems.
Below is the log output:
zextras@mail:~$ postqueue -p | grep 'host alt1.gmail-smtp-in.l.google.com' -B5
-Queue ID- --Size-- ----Arrival Time---- -Sender/Recipient-------
84A6F2C978B 2873 Mon Feb 24 18:19:18
(host alt1.gmail-smtp-in.l.google.com[108.177.98.27] said: 421-4.7.26 Your email has been rate limited because it is unauthenticated. Gmail 421-4.7.26 requires all senders to authenticate with either SPF or DKIM. 421-4.7.26 421-4.7.26 Authentication results: 421-4.7.26 DKIM = did not pass 421-4.7.26 SPF [ourdomain] with ip: [ourIP] = did not pass 421-4.7.26 421-4.7.26 For instructions on setting up authentication, go to 421 4.7.26 removed link d9443c01a7336-220d540970csi331003435ad.201 - gsmtp (in reply to end of DATA command))
zextras@mail:~$
I have ensured that SPF, DMARC, DKIM, PTR, A, and MX records are all valid.
In this server, there are two domains: domainA.net and domainB.net.
- Emails sent from domainA.net to Gmail are delivered successfully.
- Emails sent from domainB.net to Gmail fail with the above error.
I would appreciate any insights or suggestions on how to resolve this issue.
Thank you.