How to solve the problem that sent emails either do not reach or end up in spam?

Question

Email

In the process of testing the project, it turned out that letters sent to mail.ru via mailgun either end up in spam or do not reach.
DNS configured (DKIM and SPF configured for mg subdomain. Added DMARC record for mg subdomain). Emails are correctly sent to other mail services from both [email protected] and [email protected]

Answer 1

1. Is there a PTR host record for the DNS name?
2. Is the host clean when checking in DNSBL?
3. Also check the domain name in EHLO so that the one in PTR is spelled correctly.

Answer 2

Use this service to check what problems you have and fix them
mxtoolbox.com/domain

Answer 3

Write to [email protected], attach the text of the message about the delivery error or the headers of the letter from the Spam folder.