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I linked my brand new domain, to yandex.connectand I sent only a few test emails, but NO email was sent or received. I checked many times the DNSs and they seem to be fine,

When I send emails from any domain to the domain accounts, I get this alert:

"The mail server responded: 550 5.7.1 Policy rejection on the target address."

When I send emails from the domain to any domain (including itself), I get this alert:

"The mail server responded: 5.7.1 [1] Message rejected under suspicion of SPAM;"

What can the problem be?

UPDATE 1

1.- SPF, DKIM, DMARC and CNAME were configured from the very beginning but it didn't make a difference.

2.- All IP's involved are clean on blacklists.

UPDATE 2

Now I know the problem was related to SMTP BANNER, this causes Yandex security to recognize me as spammer. I still don't know the fix but that would close this thread. Thanks for your answers. If I find the fix I'll post a link.

Fahed
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2 Answers2

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What server IP address are you sending your mail from?

If you're sending it from 198.57.234.7 - lots of places will reject your email because the PTR record doesn't match (host 198.57.234.7
7.234.57.198.in-addr.arpa domain name pointer ope.open-comet.com.)

Calvin
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You can use Mail-Tester free service to check your real test email sent to their server for all types of possible problems.

P.S. Your numano.ooo DNS don't have any DMARC records right now. It should not be the reason of rejecting all your mails as spam, but you are recommended to setup DMARC correctly.

Alexander Zotov
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