By entrepidea
hello, I followed this link to set up my mail server, pretty much I did every step except for the SSL certificate.
and I use this tool: http://mxtoolbox.com/SuperTool.aspx to do a smtp test and the results showed for SMTP Banner Check is "Reverse DNS FAILED! This is a problem. " and the session transcript showed “451 4.3.0 supertool@mxtoolbox.com: Temporary lookup failure [648 ms]”, other messages seemed fine.
I also used nmap to check the open ports and found pop3, smtp, pop3s and imamps all opened, meaning the server should be up now.
Is that all? Or I still configured it wrong? I was not able to use a mail client to get to my server though?
update:
after creating an account from a mail client, I tried to make a connection, and here is the /var/log/dovecot.log:
Jan 22 21:33:26 imap-login: Info: Disconnected (auth failed, 2 attempts in 8 secs): user=admin@entrepidea.com, method=PLAIN, rip=69.248.172.40, lip=104.131.223.35, TLS, session=<NwuDnEgNrwBF+Kwo> Jan 22 21:35:07 auth: Error: passwd-file: open(/etc/dovecot/dovecot-master-users-password) failed: Permission denied (euid=111(dovecot) egid=121(dovecot) missing +r perm: /etc/dovecot/dovecot-master-users-password, dir owned by 2000:121 mode=0750)
seemed that I need to chown the file…
Thanks, Jon
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This question was answered by @ryanpq:
Do you have a proper reverse DNS record? The reverse DNS record for your droplet’s IP address is created automatically based on the name you give your droplet. If it is not named with a fully qualified domain or subdomain name no record will be generated.
Heya,
You can use a service like https://smtpfa.st/, SendGrid, Mailgun, or Postmark, much better for deliverability anyway. They allow SMTP over API, which is a good workaround and better for performance too.
Honestly the API route is usually the better option anyway, it is more reliable deliverability and you don’t have to worry about your IP getting blacklisted.
Regards
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