"Ing. Francisco Lopez G." wrote:
> 
> After I did the suggested steps everything seemed to be working
> well from inside... mails to the oustide were going well, mails to
> virtual_domain accounts were working... mails from outside were working ...
> not well at all:  if the mails from the outside are directed to our main
> domain (mydomain.com) everything works fine... but if it is directed to any
> of our virtual_domain accounts, they get a reply that says:
> 'Remote host said: 551 we do not relay'

Check out:
http://www.sendmail.org/virtual-hosting.html

This should get you started in the right direction. In short, you need
to define all the domains that Sendmail should accept messages for.

> In other words, virtual_domain is my concern here... if the mail for a
> virtual_domain originates within our network, everything is good... but if
> it does not, I get the error I got above...

Makes sense. Sendmail does not realize it is suppose to accept mail for
the virtual domains. When you send from internal, I assume its from a
defines subnet that Sendmail recognizes as local. From outside, Sendmail
does not recognize source or destination.

Sounds like you have SPAM filtering setup correctly anyway. ;)

Cheers,
Chris
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