problem with multiple sessions on *BSD.

If a message header field can't be added, the parsing is aborted and the mail
message is rejected with a "452 Insufficient system storage" response.

the message will be acknowledged, but ignored (not imported).

inet_addr() returns 0 if passed a blank string.

a message's header, body, or recipient list, or reject the message with an
specific error message based on its contents (SPAM filter, virus scan, etc).

- fixes problem with detecting bad/blank DNS server IP address.

preparation for support for procmail-like external mail filtering/processing.

Active client counter is incremented before (potentially lengthy) DNSBL lookups.

reverse-path).

New log entry when a delivery failure notification message is created.

Hopefully *BSD prototypes agree. :-(

variants (gmtime_r, localtime_r, and ctime_r) for thread-safe operation on Unix

of the sending server (if either matches, the server is exempt).

determining if a received SMTP message is for the local system or not.

Now logs length of telegram received via SMTP SOML command.

file are silently refused (same format as other text/*.can files).

existing message-ID if it's already been created for this message.

Fixed minor bug in storing recipient and reply-to net types (over allocating).
Fixed cosmetic bug in undeliverable message report (null) instead of user name.
Switched to COMMENT header field for SMTP system messages and deprecating
use of SMTPSYSMSG header field.

original messages's data, but it didn't increment the data allocation counter
for the data blocks. Now uses the new smb_incmsg() function to increment
the allocation counters, so if the original message is free'd, the data blocks
will not be prematurely reused.

toggle options (that don't fit in sys_misc), first bit used is MM_REALNAME
to control receipt of e-mail (Internet and local) based on user's real name.

Delivery failure (bounce) messages now includes error text included with new
SMTPSYSMSG header fields (created with the bounce function). The error message
text is no longer crammed into the bounce-message subject (the original subject
is retained).
SMTP reverse-path is stored in SMB msg header using new SMTPREVERSEPATH
header field type. This address is then used for delivery failure notifications
and when relaying to external SMTP servers.
Bounce-messages are now created with a sender agent type of AGENT_SMTPSYSMSG
(instead the generic AGENT_PROCESS).
sockmsgtxt() uses original RFC822 'from' and 'to' header fields if they were stored.