i am working on postfix and very new to it. just trying to learn but need to clear my confusion. i had read alot about all 3 ports and they are confusing me a bit now. please help me to understand conceptually how things are working differently on different ports.
my mail server is listening on port 25 and 465 (TLS) now when i set my outlook client to communicate TLS on port 465. it says "client can not communicate with the mail server" however when i set it to port 25 with TLS it works. and i can send email as usual. now the confusion part is my concept. does port 25 and 465 work together like FTP. port 21 and 20. like 1 port is for negotiate and another port is for data? Please help me to understand. Thanks, MYK
