Info:
The free GMX Mail App is a
much more convenient way to check your emails on your smartphone or tablet. You can download
the GMX Mail App for Android from the Google PlayStore or for
iOS from the Apple App Store.
SMTP
SMTP stands for "Simple Mail Transfer Protocol" and is
a protocol for sending emails.
IMAP
IMAP stands for "Internet Access Message Protocol" and
is a protocol for receiving emails. IMAP stores the message on a server and
synchronizes the message across multiple devices, so it can be accessed whenever you
have an internet connection.
POP3
POP3 stands for "Post Office Protocol Version 3" and is another
protocol for receiving emails. This protocol enables offline mode. Emails are
transmitted from a server to the email program you use and then deleted from the
server (unless you manually change the
settings).