> Are there any standard mail headers to add to a message to make a piece
> of mail a low-priority (bulk) for when bring transmitted?
No. Some mailers recognize "Precedence: bulk" or "Precedence: junk" or
"Precedence: list", but (a) these are nonstandard, (b) some
gateways will bounce messages with an unknown Precedence header,
and (c) some list expanders will refuse to forward messages with
certain Precedence header values. The advantage of adding Precedence
is dubious at best.
(It's difficult enough to keep consistent interpretation of standard
headers across implementations, much less nonstandard ones.)
> Is there a standard mail header to make a message be automatically
> deleted after 30 days or so (this would be helpful for the admin's on the
> rcv'ing end of the mailing list to help on the disk space part).
Not really. RFC 1036 defines Expires: and RFC 1327 defines Expiry-Date:.
The former is intended only for use by NetNews and the latter is intended
only for tunneling X.400 messages. Few Internet mail systems support
auto-expiration of messages that are already delivered, so including
one of these header fields in your outgoing mail will have negligable effect.
FWIW, there's a move to deprecate 'Expiry-date' in favor of 'Expires'
for consistency between Usenet and X.400-tunneling.
Keith
References:
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