Stephen J. Turnbull wrote:
It's one of the "VERP" settings. While "true" VERP is done by the MTA, not by agents like Mailman, the basic idea is the same: to "personalize" various fields in the message so that the original that elicited a reply (including a bounce) can be identified.
Um... Please explain what you mean by "... true VERP is done by the MTA ...". Are you thinking of SRS? I'm not aware of any thing else at the MTA level that will alter the SMTP Envelope sender (MAIL FROM:). As far as RFC 822 headers, that is almost completely up to the MSA. About the only thing that the MTA does is insert (or append) a header if it does not already exist.
IIRC there are two. One which enables VERP for various administrative messages which allows occasional checking for bounces, the other enables it for all messages. I believe this is possible on a per-list basis. You want the latter.
I think you are thinking of the Non-digest delivery option "Personalize" and its possible values: "No", "Yes", and "Full Personalization". Yes these are per-list settings.
The downside is performance, which is why VERP off is the default. Each message has to be composed individually, which increases the processor load a bit. This is probably negligible. More important, each message has to be sent individually, which can dramatically slow down processing if you have any large groups of members served by a single receiving MTA. (It is possible to specify multiple recipients for a single message; the receiving MTA will fetch it from the network once, then distribute copies. Sort of like you fax a handout to the meeting organizer, and he makes Xeroxes for all the attendees. Much more efficient than faxing one to each attendee!)
Correct. However, (IMHO) it does help make your message appear to be less spammy in nature. If you receive two questionable messages, one with your email address listed in the To: / CC: header(s) and one with out it, you are far more likely to consider the one that does not list your email address as spam than the one that does have your email address. Similarly with the use of the name in the email address with Full Personalization.
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