Hi there,
Postfix couldn’t be accessed from the outside (not localhost). Here is my netstat:
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 17841/master
tcp6 0 0 :::110 :::* LISTEN 15585/couriertcpd
tcp6 0 0 :::143 :::* LISTEN 15547/couriertcpd
Ports 110, 22, 21, 80, 53 works are open. But not 25. What’s a problem?
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I think port 25 is close on most DO droplets, or so I read on past questions, so you need to contact support.
Better yet, try zohomail or google apps (zoho is free for up to 10 users).