Victor Duchovni: > On Fri, May 15, 2009 at 12:29:00PM +0200, Teun Vink wrote: > > > Hi, > > > > I'm trying to find a nice solution for the following problem: > > > > we offer backup MX facilities for many customer domains. For this, we > > have a number of mailservers (currently 5). An F5 loadbalancer > > distributes SMTP connections between these mailservers. > > > > Of course, sometimes customers want to send an ETRN command to force > > delivery. Now, this command is received on one of these loadbalanced > > servers and this server then will empty his queue (if possible). > > However, I would like this command to be executed on all servers. > > Unfortunately, I don't really know how I could do this. > > > > Anyone here who can give me a clue on how to do this? Is it possible to > > execute a program when an ETRN command is received? > > The right solution is to tell ETRN customers to use a different IP/port > for ETRN that is NOT load-balanced. This can run a proxy that replicates > the ETRN command to all hosts that queue deferred mail for the requested > domain. > > UUCP (over TCP) is a better option for sporadically connected domains.
And to execute a command, use "check_policy_service" in smtpd_etrn_restrictions. The policy service can play the proxy role for you. http://www.postfix.org/postconf.5.html#smtpd_etrn_restrictions http://www.postfix.org/SMTPD_POLICY_README.html Wietse
