BURL MTA options
Configuration of BURL support involves setting the two MTA options
imap_password, as well as configuring the
BURL_ACCESS mapping table. The BURL MTA options
imap_password specify the credentials for the MTA to use when it connects to the IMAP server as the "submit" user, so of course these credentials (these MTA option settings) must match those configured for the IMAP server's "submit" user as configured via the
submituser IMAP option.