Mailyourdomain.tld / SMTP Port: 25 / SMTP Port: 465 with SSL. Authentication is required for IMAP, POP3, and SMTP. IMAP email access coordinates between the server and your mail application. Messages that have been read/deleted/replied to will show up as such, both on the server and in the mail application. We recommend using POP3 over SSL/TLS or IMAP over SSL/TLS since they provide increased security for your interactions with the remote mail server.