On Sat, Jan 29, 2011 at 12:36:35PM +0100, Jeroen Geilman wrote: > Just put those domains in a sender access map.
This is easily spoofed, and the OP has stated a desire to not allow
spoofed email. Hence some sort of authentication (SPF, DKIM, TLS client
certs, bilaterally agreed list of client IPs, ...) may be necessary.
--
Viktor.
