Emails from my domain getting blocked at all other domains [duplicate]

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Recently I tried to set up a new email server using iRedMail on Lubuntu.

The mail server workes very well when email conversation is in the same domain.

But when a user tries to send email to some of the most popular domains like gmail, hotmail or yahoo; all the emails are blocked.

I tried to send an email to my gmail account, this is error response I got.

host gmail-smtp-in.l.google.com[74.125.130.27] said: 550-5.7.1
[XX.XX.XX.XX 12] Our system has detected that this message is
550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent
to Gmail, 550-5.7.1 this message has been blocked. Please visit
550-5.7.1
http://support.google.com/mail/bin/answer.py?hl=en&answer=188131 for
550 5.7.1 more information. g12si14338274pat.29 – gsmtp (in reply to
end of DATA command)

The XX.XX.XX.XX part is my IP.

Latter I found that my ip is added to black list at Spamhaus. I requested them to remove my IP. They accepted my request. It also suggested to activate the smtp authentication.

But it was already set to yes as given below.

smtpd_sasl_auth_enable = yes

After a few hours, I again tried to send a mail to my gmail account, again same msg is replied.
When I check the spamhaus database, my ip is also there.

Please help.

Answer

Sorry for the mess. The problem was in other configurations of my main.cf file. It would have much easier for you guys if had posted that part.

Still thank you all of you guys.

The value for

smtpd_sasl_local_domain =

was not set. Hence the postfix was not using the smtp authentication.

The new values are

smtpd_sasl_local_domain = $mydomain

Now the smtp authentication works just fine.

Attribution
Source : Link , Question Author : Damon , Answer Author : Damon

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