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.
--
Viktor.
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