--On 13 May 2008 00:26:08 -0400 Barry Warsaw <[EMAIL PROTECTED]> wrote:
We clearly need to support personalization[1] in Mailman, although it
would be nice if there were extensions we could rely on in the MTA to
push even that out farther. I'd like to hear from any Sendmail, Postfix,
or Exim experts on this list to see if the chunking even makes sense any
more.
Yes, it does. At least, it makes sense to offer the option. There are two
cases - (a) Mailman delivers all its mail to a smarthost, (b) Mailman
delivers some or all of its mail directly to the MX hosts of the recipients.
Exim, by default, doesn't care about the number of recipients per message.
It can be configured to using "recipients_max", and in that case will
either defer or reject "recipients_max_reject" the excess. Both these
configuration variables are global. Fine tuning of similar limits is
available in ACLs, though, and can be configured differently for a known
Mailman host.
If Mailman is configured to route mail through a smarthost, then an Exim
smarthost should be configured to cope with whatever Mailman throws at it.
Otherwise, as the Exim docs caution, you might fall foul of RFC2821 section
4.5.3.1 Size limits and minimums:
recipients buffer
The minimum total number of recipients that must be buffered is
100 recipients. Rejection of messages (for excessive recipients)
with fewer than 100 RCPT commands is a violation of this
specification. The general principle that relaying SMTP servers
MUST NOT, and delivery SMTP servers SHOULD NOT, perform validation
tests on message headers suggests that rejecting a message based
on the total number of recipients shown in header fields is to be
discouraged. A server which imposes a limit on the number of
recipients MUST behave in an orderly fashion, such as to reject
additional addresses over its limit rather than silently
discarding addresses previously accepted. A client that needs to
deliver a message containing over 100 RCPT commands SHOULD be
prepared to transmit in 100-recipient "chunks" if the server
declines to accept more than 100 recipients in a single message....
etc...
--
Ian Eiloart
IT Services, University of Sussex
x3148
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