mail retriever with support for POP3, IMAP4 and SDPS

 getmail6 is intended as a simple replacement for fetchmail.
 It retrieves mail (either all messages, or only unread messages)
 from one or more POP3/IMAP4/SDPS servers for one or more email
 accounts, and reliably delivers into a qmail-style Maildir, mbox
 file or to a command (pipe delivery) like maildrop or procmail,
 specified on a per-account basis. getmail6 also has support for
 domain (multidrop) mailboxes.
 .
 Supported protocols:
 POP3, POP3-over-SSL, IMAP4, IMAP4-over-SSL, and SDPS mail.
 .
 getmail6 is based on getmail with adaptations for Python3.