+Mail delivery agent (or MDA for short) is a piece of software that performs the
+final step of mail transfer: saving it into user's mailbox.
+This is invoked either by SMTP server (MTA), mail fetcher, or chained from
+other delivery agent to perform such tasks as mail filtering, saving to
+different folders, or forwarding to different addresses.
+
+Following software can deliver to Maildir mailboxes:
+