Since LISTSERV 1.8e (13.0), it has been possible to delay execution of DISTRIBUTE jobs until a given time, by use of the JOB card keyword AFTER=. However, this was never an option for regular postings to mailing lists.
This tag, like all other X-LSV tags inserted by LISTSERV, are deleted from the header before being sent to the recipient. The date and time parameters can be specified in any of the formats supported by LISTSERV, except those that contain white space. It is suggested that the format
Important: The value MUST NOT be enclosed in quotes or LISTSERV will not recognize it. Similarly, the value MUST NOT be a standard RFC822 date field. A setting like
X-LSVAfter: Tue, 20 Oct 2009 12:00:00 -0400
is invalid, and will not be recognized.
Note: This feature requires either a mail client that is capable of adding ad-hoc RFC822 headers into messages, or the ability to construct RFC821/822 email messages manually and feed them directly to SMTP for delivery to LISTSERV.
HELOMAIL FROM:<joe.user@example.com>
RCPT TO:<lunch@listserv.example.com>
DATA
Date: Tue, 20 Oct 2009 09:14:00 -0400
From: joe.user@example.com
To: lunch@listserv.example.com
Subject: Lunchtime!
X-LSVAfter: 2009-10-20 12:00:00
Note: If LISTSERV finds an X-LSVAfter: header in the message that either is blank or does not match any of the standard date/time formats understood by the server, then the following will appear and the message will be processed immediately:
20 Oct 2009 09:26:35 Processing file 0078 from MAILER@LISTSERV.EXAMPLE.COM
>>> Invalid date/time specification in X-LSVAfter: tag - ignored
20 Oct 2009 09:26:35 Processing mail from joe.user@example.com for LUNCH
20 Oct 2009 09:26:35 Message DISTRIBUTEd to 125 recipients.
