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What do you need to avoid spam in GMail?
Everything is sent by Postfix. But it ends up in spam in Google :(
What does it take for Google to believe that this is not spam?
Certificate?
Paid services?
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There is an excellent service that checks the correctness of the mail server settings. At the same time, it will tell you what needs to be corrected so as not to get into spam.
mail-tester.com
One problem - if the domain got into spam, then the probability is quite high that it will not get out of there.
It's best to change the IP, register PTR, SPF, DKIM, all the points from the Bulk Senders Guidelines and pray :)
In general, if you still can't get out of spam, you can try external mailing services (such as Sendgrid and others)
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