Cant send and receive mails

[vladyslav]

Using Centos 7 + Vesta
have a domain pointed to my VPS all works fine except mail
exim main.log contains next

Code: Select all

2019-12-08 15:22:26 dovecot_login authenticator failed for (User) [46.38.144.179]: 535 Incorrect authentication data ([email protected])
2019-12-08 15:22:26 no host name found for IP address 46.38.144.146
2019-12-08 15:22:32 dovecot_login authenticator failed for (User) [46.38.144.146]: 535 Incorrect authentication data ([email protected])
2019-12-08 15:22:39 no host name found for IP address 46.38.144.17
2019-12-08 15:22:46 dovecot_login authenticator failed for (User) [46.38.144.17]: 535 Incorrect authentication data ([email protected])
2019-12-08 15:22:54 no host name found for IP address 46.38.144.146
2019-12-08 15:23:00 no host name found for IP address 185.36.81.230
2019-12-08 15:23:01 dovecot_login authenticator failed for (User) [46.38.144.146]: 535 Incorrect authentication data ([email protected])
2019-12-08 15:23:02 dovecot_login authenticator failed for (User) [185.36.81.230]: 535 Incorrect authentication data (set_id=testuser)
2019-12-08 15:23:03 no host name found for IP address 185.36.81.246
2019-12-08 15:23:05 dovecot_login authenticator failed for (User) [185.36.81.246]: 535 Incorrect authentication data (set_id=contact)
2019-12-08 15:23:07 no host name found for IP address 46.38.144.17
2019-12-08 15:23:14 dovecot_login authenticator failed for (User) [46.38.144.17]: 535 Incorrect authentication data ([email protected])
2019-12-08 15:23:14 no host name found for IP address 46.38.144.179
2019-12-08 15:23:21 dovecot_login authenticator failed for (User) [46.38.144.179]: 535 Incorrect authentication data ([email protected])
2019-12-08 15:23:22 no host name found for IP address 46.38.144.146

[zimmer]

Your log doesn't say that it's DNS problem, someone is trying to access your mailbox by using brute-forcing, which is quite obvious.
It would be better to transfer this question to Mail section.

But frankly speaking about DNS, have you created MX records on your VPS? also are you using PTR? If yes, then it's not DNS problem at all. Check configs, dovecot, regex and exim conf.