Why doesn't Google let my emails from the server, Unrouteable address 550-5.7.1 error?

Question

Exim

I can not send mail from the server, it does not reach.
Exim, Centos 7, Vestacp.
PTR registered, matches the hostname, mydomain.ru
exim.conf -> helo_data = mydomain.ru

2018-12-18 00:11:54 1gZ0B8-0008MD-UV <= [email protected] U=admin P=local S=865 [email protected]
2018-12-18 00:11:55 1gZ0B8-0008MD-UV ** [email protected] R=dnslookup T=remote_smtp H=gmail-smtp-in.l.google.com [64.233.162.26] X=TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128 CV=yes: 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\n550-5.7.1 authentication checks. To best protect our users from spam, the\n550-5.7.1 message has been blocked. Please visit\n550-5.7.1  https://support.google.com/mail/answer/81126#authentication for more\n550 5.7.1 information. e23-v6si10891704ljg.187 - gsmtp
2018-12-18 00:11:55 1gZ0B9-0008MI-8l <= <> R=1gZ0B8-0008MD-UV U=exim P=local S=2896
2018-12-18 00:11:55 1gZ0B8-0008MD-UV Completed
2018-12-18 00:11:55 1gZ0B9-0008MI-8l ** [email protected]: Unrouteable address
2018-12-18 00:11:55 1gZ0B9-0008MI-8l Frozen (delivery error message)

Answer 1

Unrouteable address is returned by your server when it tries to deliver a notification that it was unable to deliver a message. And Google seems to swear at an incorrectly configured DKIM or SPF.