in reply to MAIL FROM command

Hello im getting this e-mail errors from my server.


Jun 3 17:20:02 hosting3 postfix/smtp[22571]: 005679962C4: to=, relay=mx.netcabo.pt[212.113.174.24]:25, delay=83, delays=0.01/0.01/1.3/82, dsn=4.0.0, status=deferred (host mx.netcabo.pt[212.113.174.24] said: 451 #4.1.3 Domain of sender address does not resolve (in reply to MAIL FROM command))

and many
Sender address rejected: Domain not found (in reply to RCPT TO command))


Thanks.

 

Does the sender domain exist in DNS? Do you get an answer when you run

Code:

dig senderdomain.tld

?

 

thanks, yes the problem is with dns.
I think is a bad config,and is fine now thanks.