Why are letters not sent, but the reception works?

Question

Exim

Hello. In general, this is the case. There is an exim server + roundcubemail
Letters come to it successfully, but they don't want to go.
The server is in DC. The server has its own named for domains, but the hoster has a DNS manager in which I also have to enter data for the domain.
In both, I added the domain.com MX record,
but the trouble is that when you try to send an email to Google, for example, this error is returned

Mistake

[email protected]
host gmail-smtp-in.l.google.com [74.125.131.26]
SMTP error from remote mail server after pipelined end of data:
550-5.7.1 This message does not have authentication information or fails to pass
550-5.7.1 authentication checks. To best protect our users from spam, the
550-5.7.1 message has been blocked. Please visit
550-5.7.1 https://support.google.com/mail/answer/81126#authe... for more
550 5.7.1 information. r9-v6si64653733ljg.204 - gsmtp
Reporting-MTA: dns; мой домен
Action: failed
Final-Recipient: rfc822;[email protected]
Status: 5.0.0
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.1 This message does not have authentication information or fails to pass
550-5.7.1 authentication checks. To best protect our users from spam, the
550-5.7.1 message has been blocked. Please visit

How to solve this problem? Thank you all in advance.

Answer 1

It is written in English that the letter did not pass authentication, DKIM, SPF, DMARK will help solve the problem