Reason for gmail spamming emails from my server? [closed]

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I have been using some SMTP server for sending mails to gmail server. The problem i am facing is all the mails from a particular domain(say ...@somedomain.info) are treated as Spam by gmail. Is there any way to solve this issue?

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Have you analyzed your outgoing mails? What SpamAssassin score do they get if you send them to a server with a SpamAssassin filter?

Normally your issue indicates a wrong mail server setup. Wrong DNS setup, blacklisted on DNSBLs, invalid DKIM or SPF setup, invalid headers or mail encoding, ...

But at first you have figure out what the root cause is. You only stated the impact. And SpamAssassin tests hundreds of rules for many common mail problems. So knowing the rules that get hit lead to finding the cause(s).

If you like you could write a mail to mailtest[AT]malowa.de and I will analyze the score.