msgs and SPAM database lookup.

-- Albert Einstein

Things return allocated pointers with errors in them now.
FTP server updated, the rest to follow "soon".

FidoNet netmail messages.
Fix problem reported by Rastus and Nelgin.

free() the mailproc causes a double-free crash.

throttling, temp-banning, and filtering.

(e.g. "SUBMISSIONS Server" becomes "SMTPS Submission Agent", etc.).
Removed the redundent "<protocol> Server listening" log lines.

If there's a problem, bounce() will re-log them as LOG_WARNING later.

and fix all the things.

Hopefully this allows fallback to plaintext after a TLS failure now.

setting the session active.

user name (once authenticated).
Lower the log level of the POP3S "Unable to set session active" messages,
apparently these are normal occurence with drive-by bots and not error.log
worthy.
Fixed the !Cryptlib error in sock_recvbyte log output (sock, not socket).

failure... do that.

not everyone is that inept.

"Enable to" (TLS-related) error messages. This might help a little to
understand why these errors are happening and allow us to consider
lowering the log level(s) of commonly-occuring cases from LOG_ERR.

support though.

ESMTPS and ESMTPSA coming soon!

for new TLS-related settings:
SubmissionsPort -> TLSSubmissionPort
POP3SPort -> TLSPOP3Port
USE_TLS_SUBMISSIONS_PORT -> TLS_SUBMISSION
USE_POP3S_PORT -> TLS_POP3
There was actuall a typo in the "USE_POP3S_PORT" string anyway. <shrug>

section:

POP3SPort=995
SubmissionsPort=465

And two new mail options:
USE_SUBMISSIONS_PORT
USE_POP3SS_PORT

These are the last of the two option bits for the mail server.

Support STARTTLS in SMTP and STLS in POP3.  This includes the sendmail
thread.  Clients can now be configured to use STARTTLS with Synchronet
mail services, and Synchronet will attempt to deliver securely when
possible (though it will fall back to plain text delivery when necessary.)

This touches a *lot* of mail server stuff, so some instability is not
unlikely.

Of course, RFC8314 (Jan, 2018) officially recommends implicit TLS on the TLS
ports now, so support for that should be next.

HANDLE_PENDING() contains a return, so it's theoretically possible that the
memory allocated by the previous JSVALUE/STRING_TO_... allocation could
be leaked. So now we pass an optional pointer to HANDLE_PENDING() which will
call free() on it if it's not NULL, and then sets it to NULL for good measure.

SPAM-tagged messages will not be listed/downloaded. This is useful if for
example you use POP3 to download mail to your phone and have limited
storage or sorting options. The SPAM-tagged messages will remain in your
inbox on the BBS so you should use another POP3 or local mail client to
download and delete those messages (which could potentially include
false positives).

portion of the To: header field in the RECIPIENT name as FTN software
doesn't typically expect/handle that.

charset" for the message plain-text instead of hard-coding ISO-8559-1. If no
default charset is configured, specifies ISO-8559-1 just as before.

logic everywhere.
Enforce the sys_misc SM_DELREADM flag (SCFG->Message Options->Kill Read E-mail)
in more places (set the Kill After Read flag automatically).
Create a Message-ID (RFC822-style) for locally created email messages.

will set the "KILLREAD" attribute flag on any SPAM-tagged email messages so
that after they are read (or downloaded via POP), they will be auto-deleted by
smbutil maintenance. Defaults to off.