I have my school's e-mail account being checked via IMAP SSL/TLS on port 993. It is an Exchange mailbox but I did not want to to use MAPI and have my device "managed" by the school. Anyhow, this ...
I'm using my own SMTP server with SMTP AUTH for sending mails. The greeting looks like: 250-[...fqdn...] Hello [...fqdn...] [...ip...], pleased to meet you 250-ENHANCEDSTATUSCODES ...