[ Date Index ] [ Thread Index ] [ <= Previous by date / thread ] [ Next by date / thread => ]
On Thu, Mar 25, 2010 at 8:12 PM, Sam Grabham wrote: > Does anyone know how to clone all incoming email traffic to 2 separate smtp > servers. > > I want to prove a concept but need the same emails on both servers to > compare. Not sure how much you're restricted to sendmail, but qpsmtpd -- an highly configurable, open source MTA, written in Perl -- is really good at that kind of thing. As Gordon said, be aware of backscatter. If one of the two SMTP servers has a (temporary) problem and can't deal with a certain email, you probably don't want it to send a DSN to the sender. In this context, it's also worth thinking of XCLIENT, which is a little known Postfix extension (but it's easy to write a plugin for qpsmtpd that does the same) that lets you tell the recipient MTA about the original sender's IP address and HELO/EHLO domain. Useful for DNSBL lookups, even if all mail comes from the same MTA. Martijn. -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html