I have mail in a box installed in my machine. All seems that works fine. All ports neeeded are mapped to my server. I can send mails and receive mails from other domains.
But I need to connect to the accounts by mail clients (k9mail in androids and “mail” in iphones). It seems that there are no connection when i try to configure the mail clients. This is the settings that i put in the clients:
server: I try with “subdomain.dyndns.org” and “box.subdomain.dyndns.org”.
I try with starttls and with no security too.
When i try to connect, the clients are waiting for a long time and then says “Cannot connect to server”.
I think that it is any firewall rule inside of the “mail-in-a-box”. ¿How can i fix it?