List Keyword Reference for LISTSERV 17.5

ALWAYS USE THIS KEYWORD WITH CAUTION!

Misuse of this keyword can and will allow mailing loops onto your list!

Normal

LISTSERV uses its "normal" suite of loop checking heuristics.  Tests considered to be obsolete are not conducted. This is the default for Loopcheck= beginning with LISTSERV 14.5.  See the LISTSERV 14.5 release notes for more details.

Full

LISTSERV uses its full suite of loop checking heuristics to check incoming mail for loops.  This includes tests considered to be obsolete.

None

All LISTSERV loop checking and "command to list" checking is disabled for this list. WARNING: "None" tells LISTSERV that, by definition, anything that reaches its reader is NOT a delivery error. It is never a good idea to use this parameter except in special cases where a bug is suspected in the loop checking heuristics. Generally this parameter should not be used without checking with L-Soft first, and only for the diagnosis of an existing problem.

None,Allow-Bounces

Allows the list to accept error messages that would normally be bounced to the list owner.  This makes it possible to direct the Errors-To= keyword setting to a LISTSERV list rather than to a specific person. "Allow-Bounces" MUST be specified in conjunction with "None". Specifying just "Loopcheck= Allow-Bounces" will result in a syntax error when the list header is stored.

Noorigin

Allows the list owner to disable the check for "known mailer origins" such as MAILER, POSTMASTER, ROOT, UUCP, et al. Mail whose 'From:' field is the address of the local mailer is still trapped, but wildcard checks on the mail origin are disabled. 

Nobody

Allows the list owner to disable the check for identical text in the body of incoming mail only. LISTSERV relies only on the Subject: field of the mail message to determine whether or not mail is looping. This is a very dangerous option: it means that any mailer not using one of the "standard" subjects known to LISTSERV will cause a loop. 

NoCRC

Allows the list owner to disable CRC (cyclical redundancy check) check of incoming mail. CRC loop checking calculates a "checksum" based on the contents of the mail message and compares it to other incoming mail to spot duplicates.

NoSpam

Allows the list owner to disable the anti-spamming filters to incoming mail.

Spam-Delay(n)

Allows the list owner to modify the number of minutes LISTSERV holds mail from non-subscribers before releasing it to the list. The assumption is that, within n minutes, a spam alert may or may not arrive regarding non-subscriber mail. The list owner can disable this function for his list by coding "Loopcheck= Spam-Delay(0)", or can tune it to his preference by simply specifying the number of minutes for LISTSERV to hold the mail. The default is 10 minutes, or "Spam-Delay(10)".