Configuration on devices
Transmission protocols
The only available transfer protocol for retrieving e-mails is IMAPS, the secure variant of IMAP, via port 993. The IMAP protocol has the advantage that all mails, incoming, outgoing, and the recycle-bin are located on the server. In the e-mail program, the e-mails are cached locally, so that you can work without a network connection.
To send e-mails, a TLS-encrypted SMTP connection via port 587 is used.