I have an email server running with Dovecot, and while trying to manage my email with Thunderbird I'm getting a weird error:
If I enable the port
993, Thunderbird works fine (either using
But when I disable
143 (To always force SSL), Thunderbird can not establish a connection.
I first tough that the SSL settings or certificate could be wrong, but I checked them by using the command
openssl s_client -showcerts -connect imap.foo.com:993 -crlf and everything seems to be alright.
Is it then necessary to have
143 port enabled to use the
993 for an SSL IMAP connection? Is it for being capable of establishing the first contact?