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    An A record on mail.mydomain.com set to your IP, a MX record on mydomain.com set to mail.mydomain.com and you probably also wanna set up two TXT records: DKIM and SPF… Commented Oct 24, 2016 at 6:36
  • ok I will try but, so I don't need pop.mydomain.com, or smtp.mydomain.com? then on gmail for example, should I just use always mail.mydomain.com independently of the protocol? Commented Oct 24, 2016 at 9:40
  • ok tried all that, did dig +short mail.mydomain.com, ip is correct, but telnet on ports 587, 465, 25 none of them connects.. Commented Oct 24, 2016 at 10:10
  • Yep, just mail.mydomain.com for SMTP, IMAP and POP. Have you actually set up your mail server and opened that ports on a firewall? Commented Oct 25, 2016 at 14:03