On Fri, 2004-11-05 at 03:13, Alexander Dalloz wrote: > Am Fr, den 05.11.2004 schrieb Ow Mun Heng um 4:05: > > > > (note: some mail servers, notably qmail, always send mail to a single > > > recipient at a time even if there are multiple recipients for the mail at a > > > domain, and others can be configured to do so. Whilst this is very > > > inefficient, particularly for large messages, mail you receive from such mail > > > servers should always cause your mail server to add the "for" clause in the > > > Received: header) > > > > Does sendmail has the same behavior. I would like to know as well since > > it _is_ very inefficient. > > No, Sendmail sends multiple "RCPT TO:" with one mail. > > sendmail[31362]: iA539ZvT031349: to=<foo@xxxxxxxxx>,<bar@xxxxxxxxx>, > ctladdr=<alexander.dalloz@xxxxxxxxxxxxxxxx> ... It can sometimes be useful to get sendmail to send mail separately for each recipient at a domain though. For instance, if you're running a mailing list (with Bcc'ed recipients) and you're getting bounces from a site that doesn't show the envelope recipient address as the address being rejected (e.g. some MTAs will map the recipient address to a "full name" before deciding if the mail is deliverable, and then say that mail to "full name" is undeliverable), this can result in problems finding the address that is bouncing in order to remove it from the list. By having the mail sent one recipient at a time, the recipient address may get added to a Received: header and this may help identifying the bad address. The way I do this in sendmail is: 1. Add a new mailer "sesmtp" to (the end of) my sendmail.mc, which delivers mail to a single recipient at a time: MAILER_DEFINITIONS Msesmtp, P=[IPC], F=DFMuXa, S=EnvFromSMTP/HdrFromSMTP, R=EnvToSMTP, E=\r\n, L=990, T=DNS/RFC822/SMTP, A=TCP $h (this is just a copy of the esmtp mailer without the "m" flag to indicate that it can deliver to multiple recipients) 2. Add a mailertable entry to have mail to the suspect's domain sent using this new mailer: bigfoot.com sesmtp:bigfoot.com So all mail to bigfoot.com gets sent in separate emails and I have a chance if figuring out which bigfoot address is forwarding somewhere that bounces. Paul. -- Paul Howarth <paul@xxxxxxxxxxxx>
