See the bug for more information:
https://bugzilla.gnome.org/show_bug.cgi?id=514041#c9

https://bugzilla.gnome.org/show_bug.cgi?id=665421

I'll care about deprecated APIs again when a gtk4 release date is
announced.  Meanwhile it's just causing distros unnecessary pain.

(cherry picked from commit a28a512c)

This is the same fix as was done in evolution within bug #628139

Default to not deleting mail kept on the POP3 server at all rather than
automatically deleting after X days.  Helps avoid accidental data loss.

(cherry picked from commit 230e8393)

Check that we found a CamelProvider before dereferencing it.

(cherry picked from commit 13c8e078)

I forget to write wrapper functions for CamelFolderClass.refresh_info()
and CamelFolderClass.refresh_info_finish() even though the class methods
have been there for awhile.

Thanks to Srini for pointing this out.

(cherry picked from commit 1baddb8b)