Unable to send mails to aol users

[ofanz]

Hi all,

my proxmox is unable to send mails to aol users? I found the following entry in the log file:

Oct 17 06:52:08 localhost postfix/smtp[5704]: C02777087D5: to=<XYZ@aol.com>, relay=mailin-04.mx.aol.com[64.12.138.89], delay=422085, status=deferred (host mailin-04.mx.aol.com[64.12.138.89] said: 421-: (DNS:NR) http://postmaster.info.aol.com/errors/421dnsnr.html 421 SERVICE NOT AVAILABLE (in reply to end of DATA command))

 

[dietmar]

Your Proxmox server does not have a DNS PTR record (reverse lookup). Many mail servers does not accept mails from hosts without a correct PTR record. Just add the corresponding PTR record to the DNS server and everything will work.

Best regards,

Dietmar