PPemail offers the common methods to sync your device(s) including IMAP, POP3, SMTP, and SSL/TLS.
IMAP & POP3 are for incoming (getting your email) while SMTP works on the outgoing (sending emails). SSL/TLS adds a layer of security but may not function properly on older systems. The best protocol for you depends on how you use email.
Incoming
IMAP: Better when syncing across multiple devices
POP3: Best for keeping account information independent
See a detailed comparison between IMAP & POP3 at Wikipedia
Outgoing
SMTP: Protocol to send outgoing email
Security
SSL/TLS: Required security feature
For most, the main decision is between POP3 and IMAP.
Because security is important, send all emails only through authorised SMTP and enact SSL/TLS. Update the device’s system if the current one prevents it.
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