[CentOS] [OT] Forcing sendmail to NOT take its domain from DNS

Nick Bryant list at everywhereinternet.com
Fri Nov 11 05:26:59 UTC 2005

> On Thu, 2005-11-10 at 21:55, Nick Bryant wrote:
> > It seems when sendmail starts up it takes the host name from a
> gethostname()
> > which in turn is derived from a reverse lookup of the machines IP.
> >
> > It uses this hostname as the default "From" address in outgoing mails
> e.g.
> > if the hostname was box.foo.bar mails from root would appear as
> > root at box.foo.bar
> >
> > In my setup foo.bar is an internal domain which isn't recognized by
> remote
> > MTA's as being a valid domain, understandably.
> >
> > So I'd like to change foo.bar to foo.bar.com so the box can send mails.
> Just set MASQUERADE_AS in sendmail.mc and restart sendmail
> with 'service sendmail restart' (the init script takes care
> of rebuilding sendmail.cf)  If you want root's mail to also
> be masq'd, remove the EXPOSED_USER setting.  If you are also
> receiving mail, be sure to put all the names to accept as local
> in the local-host-names file (also needs a sendmail restart).

Many thanks, that was too easy (always is when you know how).

More information about the CentOS mailing list