On Tue, Jul 19, 2011 at 06:45:46PM -0500, Jay G. Scott wrote:
> Management wants email to
> user@ <a non-existent machine> .arlut.utexas.edu
> will be treated as though it had been addressed to
> u...@arlut.utexas.edu
Regardless of the MTA, this requires at the very least a wild-card MX
record, do you have that?
If a wildcard MX is in place, and mail to:
mana...@pointy-haired-bosses.arlut.utexas.edu
needs to be delivered, the next question is whether the delivery is
local (system accounts and local aliases(5)) or to a virtual mailbox,
or is relayed further for delivery, or is aliased to a real address.
> relay_recipient_maps = regexp:/etc/postfix/pfrecipient_canonical
This is used when the recipient domain is listed "relay_domains":
relay_domains = .arlut.utexas.edu
> This file looks like this for the user schumi
> /^schumi@.*\.arlut\.utexas\.edu$/ sch...@arlut.utexas.edu
With Postfix 2.8 or later, you can solve the problem upstream:
main.cf:
pcre = pcre:${config_directory}/
# Last resort. Edit remote SMTP commands
#
smtpd_command_filter = ${pcre}smtpd_cmd.pcre
smtpd_cmd.pcre:
# Sweet smell of Sendmail:
/^(RCPT TO:<\S+@).*?\.(\Qarlut.utexas.edu\E>.*)$/ ${1}${2}
The above can also be be done with regexp, but I prefer PCRE, so
you'll have to craft your own regexps if that's what works for you.
With this, there is no mail to sub-domains of "arlut", all mail
appears to have been addressed correctly, but recipient validation
is not defeated, despite the wild-card rewrite, since the rewrite
happens upstream in the SMTP I/O routines.
This of course requires that there be no real sub-domains that
you want handled without truncation.
--
Viktor.
