I have NO idea how to fix this. I get these errors from exim when trying to send emails from discourse. It is connecting fine, but not about to send.
2018-10-19 00:07:41 no host name found for IP address 172.17.0.2 2018-10-19 00:07:44 no host name found for IP address 172.17.0.2 2018-10-19 00:07:44 TLS error on connection from (localhost.localdomain) [172.17.0.2] (cert/key setup: cert=/usr/local/vesta/ssl/certificate.crt key=/usr/local/vesta/ssl/certificate.key): Error while reading file.
When running discourse-doctor it returns:
For a robust test, get an address from http://www.mail-tester.com/ Sending mail to REDACTED . . Testing sending to firstname.lastname@example.org using email@example.com:*******@smtp.marketers.coop:587. SMTP server connection successful. Sending to firstname.lastname@example.org. . . Sending mail failed.