[CentOS] Sendmail Masquerade

Mon Aug 20 10:31:34 UTC 2012
Ken Smith <kens at kensnet.org>

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.


(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?



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