Both let your app fetch mail, but they handle storage very differently.
- IMAP keeps your mail on the server and syncs every device. Read, delete, or file a message on your phone and it looks the same in Outlook and Webmail. Best if you use more than one device.
- POP3 downloads mail to one device and (by default) removes it from the server. Good if you want a local copy and use only one computer, but other devices won't see those messages.
We recommend IMAP for almost everyone. Settings: IMAP port 993 (SSL/TLS); POP3 port 995 (SSL/TLS); both use mail.yourdomain.com and your full email address. Note IMAP uses more server storage, so watch your mailbox quota. Unsure which to pick? Open a ticket.
