I have a VPS in one provider (Provider A), and I have set the email server all works ok. in another provider (Provider B) I have the domain registered. So, let's assume it is mydomain.com

On the provider B: I had created a subdomain called mail.mydomain.com, configured the dns as follow:

HOST         Type    Result
(empty)      A
www          A
mail         A

Then on mail exchange records I've configured as follow:

HOST            Priority   Result
(empty)         30

On the subdomain mail.mydomain.com, I have configured the dns as follow:

HOST         Type    Result
(empty)      A
www          A
  • 1
    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… – wb9688 Oct 24 '16 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? – sudo.ie Oct 24 '16 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.. – sudo.ie Oct 24 '16 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? – wb9688 Oct 25 '16 at 14:03
  1. Set up your mail server(s) to listen at mail.mydomain.com
  2. Make sure your firewall doesn't block your mail server(s)'s ports
  3. Set an A record on mail.mydomain.com pointing to your IP address
  4. Set a MX record on mydomain.com pointing to mail.mydomain.com
  5. It should be working, but you probably wanna set up DKIM, DMARC and SPF
  • it does not fix my issue, but it is certain the way DNS should be set. – sudo.ie Oct 25 '16 at 15:26
  • @sudo.ie: So, what's your issue? – wb9688 Oct 26 '16 at 15:07
  • all seems ok, but it still not work, so dns seems to point ok, mail server looks ok, firewall lookgs ok, but when I try to connect to mail.mydomain.com on any email port, it does not connect. – sudo.ie Oct 26 '16 at 16:08

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