How to write an SMTP client so as not to get on the list of spammers?

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sitev_ru2016-12-27 13:51:09

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sitev_ru, 2016-12-27 13:51:09

Wrote a client based on the SMTP protocol. After sending from my computer to my own email, I got into the list of spammers. Mylru swears by an error:

550 spam message rejected. Please visit help.mail.ru/notspam-support/id?c=...

How to send emails to YOURSELF and not be a spammer?

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3 answer(s)

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Mercury13, 2016-12-27
@Mercury13

Yes, there is an evil spam detector there ...
Write a message using a real mailer and repeat as many fields as possible from this mailer.
Perhaps the most important is the User-Agent. 80 percent of bot filters refer to it.

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Vladimir Dubrovin, 2016-12-27
@z3apa3a

This article has some basic guidelines.

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Newred, 2018-10-06
@Newred

Both letters are sent from their smpt server.
Everything is simple here. If the letter is not signed with DKIM, it is 90% spam. Since all mailers will mark it as suspicious.
Encryption: yes
If the email is signed with DKIM, it is verified.
Encryption: yes