[CentOS] Sendmail Masquerade

Ken Smith
Mon, 20 Aug 2012 10:31:34 -0000

Hi All,

I'm usually quite good with sendmail on Centos 5.8 but I must have
missed something here. I've not done this before but, I want to set
sendmail so that its outgoing mail appears to come from the domain of
the network it lives on. Its real hostname is server2.domain.co.uk ( the
domain bit is substituted for this post) and I want it to send as
domain.co.uk, that is really valid, but the specific host
server2.domain.co.uk does not have an A record and other mailservers
reject its outgoing mail because server2.domain.co.uk does not resolve.
But with these settings in sendmail.mc it still sends as
server2.domain.co.uk if I simply type "mail -s test kens at
kensnet.org"
into bash.

MASQUERADE_AS(`domain.co.uk')dnl
FEATURE(masquerade_envelope)dnl
FEATURE(masquerade_entire_domain)dnl
MASQUERADE_DOMAIN(domain.co.uk)dnl

(Yes I have done the m4 bit and restarted sendmail)

If I telnet to sendmail on port 25 and manually send as
username at domain.co.uk it has the right "from" address.

So what have I missed?

Thanks

Ken



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