Reverse DNS does not match SMTP Banner - POSTFIX MAIL SERVER

maciel

I am having problems with email in the spam box of Gmail and Outlook the mail server uncommented the following line.

smtpd_banner = $ myhostname ESMTP $ mail_name

even making this change I have wssa warning message on the server

Reverse DNS Does Not Match SMTP Banner

The rest is all working and the IP and nameserver are not in the blacklist

For more informations:
https://mxtoolbox.com/domain/domain.com/

I want to be able to contribute to the community and the people of this project.
Thanks!

azorano

Hi,
just found out I have the same error as I learnt Postfix can't deliver to some mail servers... Gmail for example is OK.
SMTP Banner Check maybe be causing this? I can't deliver to a specific large email brand.

Apr 30 14:00:43 server1 postfix/smtp[22566]: 8F2A12A00A4: to=xxx@xxx.xxx, relay=mx.xxxx.xxxx.xx[123.123.123.123]:25, delay=0.74, delays=0.16/0/0.55/0.03, dsn=5.0.0, status=bounced (host mx.xxxx.xxxx.xx[123.123.123.123] said: 554-sorry, mailfrom without . in domain is administratively denied 554 nao sao aceites remetentes sem '.' no dominio (#5.1.7) (in reply to MAIL FROM command))

without '.' (dot) in domain? humm
any thoughts?
thanks

azorano

https://support.kerioconnect.gfi.com/hc/article_attachments/360014234939/131.png

I've been reading. There's something related to MaxHops?

535, "5.7.1", Application-specific password required. For more information, see Sign in using App Passwords.
554, "5.6.0", Mail message is malformed. Not accepted.
554, "5.6.0", Message exceeded 50 hops, this may indicate a mail loop.
554, "5.7.0", Too Many Unauthenticated commands.

can be any of these.