RFC-822 "To:" header field is now added to the SMB header as a generic
RFC822HEADER field (otherwise, unused).

descriptors are re-used by subsequent connections.

present and stored RFC822REPLYID as "In-Reply-To", if present.

Line counting and display and time-slice yields every 100 lines.

Hopefully solves problem of asynchronous log output during sbbsctrl shutdown.

reported.

Updated some of the other "blocked" log entries (cosmetic).

matchuser() now optionally matches built-in sysop aliases.
Added support for SMTP semaphore file created after receiving new mail.

Added "default user" featur for "catch all" e-mail.

addresses (e.g. user@host:port).
alias.cfg can now specifcy external servers (different address or port), and the
'*' wildcard char is supported (e.g. *@somedomain.com *@otherdomain.com).

User #1 pseudonym matching is now handled by matchuser().

Fixed potential buf[-1] reference in message saving.
Set a hard maximum number of recipients in a given mail session (currently 1000).