We installed the Cyber panel From Digitalocean, unfortunately no mail are sending out from the server. Getting error message on rainloop " Undelivered Mail Returned to Sender". We also installed the ConfigServer Security & Firewall its log email also not getting. We run grep postfix the out put added below.
Note: Original domain name was renamed or hidden as server.net
root@server:~# journalctl -f | grep postfix
Jun 11 22:31:22 server postfix/submission/smtpd[126326]: connect from localhost[ 127.0.0.1]
Jun 11 22:31:22 server postfix/submission/smtpd[126326]: TLS SNI localhost from localhost[127.0.0.1] not matched, using default chain
Jun 11 22:31:23 server postfix/submission/smtpd[126326]: 24779FEA65: client=loca lhost[127.0.0.1], sasl_method=PLAIN, [email protected]
Jun 11 22:31:23 server postfix/cleanup[126329]: 24779FEA65: message-id=<48922c71 [email protected]>
Jun 11 22:31:23 server postfix/qmgr[125626]: 24779FEA65: from=[email protected], size=1158, nrcpt=1 (queue active)
Jun 11 22:31:23 server postfix/submission/smtpd[126326]: disconnect from localho st[127.0.0.1] ehlo=2 starttls=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=8
Jun 11 22:31:23 server postfix/pipe[126330]: 24779FEA65: to=<[email protected] n>, relay=dovecot, delay=0.09, delays=0.06/0.01/0/0.02, dsn=5.1.1, status=bounce d (user unknown)
Jun 11 22:31:23 server postfix/cleanup[126329]: 394A1FEA72: message-id=<20220611 [email protected]>
Jun 11 22:31:23 server postfix/qmgr[125626]: 394A1FEA72: from=<>, size=3434, nrc pt=1 (queue active)
Jun 11 22:31:23 server postfix/bounce[126332]: 24779FEA65: sender non-delivery n otification: 394A1FEA72
Jun 11 22:31:23 server postfix/qmgr[125626]: 24779FEA65: removed
Jun 11 22:31:23 server postfix/pipe[126330]: 394A1FEA72: to=[email protected], r elay=dovecot, delay=0.02, delays=0/0/0/0.02, dsn=2.0.0, status=sent (delivered v ia dovecot service)
Jun 11 22:31:23 server postfix/qmgr[125626]: 394A1FEA72: removed
Postfix and Dovecote status are showing working fine, we also checked firewall all the ports are open. If we send a mail outside to gmail or other provider it was returning with subject line “Undelivered Mail Returned to Sender” but if we send same domain name other email address it was delivering in side the serve. I don’t know what was the issue. So sad to see it was not working.
Two more day I will try other possible ways other wise i need to go install CWP control panel as it was working fine in our another server and their support plan are very lower than Cyber panel. Totally fedup love to use cyber panel but we faced many issues like website automatically down some time and manully we need to restart OpenLiteSpeed two or three time we need to click on the restart button to work.
See it may happen while we copy the log, Iam assure email address and everything is correct , but not getting an resolution to fix this email delivery.
I think you have port 25 closed by DO. Even you open all ports won’t help when provider blocking it.
Default they blocking port 25 from all users, you need open support ticket and ask them open it.