Can sendmail be configured to accept only e-mail from certain domains?

[James A. Donovan]

So far, I've been lucky enough to be able to avoid having to run sendmail, and needing to deal with all of it's related security issues. Unfortunately for me, that's about to change....

I need to know if it's possible to limit sendmail to accepting connections only from a select few domains. It seems to me that it should be possible, but I'm just not familiar enough with sendmail to know what's needed.

Pointers to clear documentation on the subject would be appreciated. Meanwhile, I'm heading off to sendmail.org to root around there for some answers....

[Geoff Wild · Accepted solution]

Hmnmmmmnmmm...

You could use the access db...

/etc/mail/access


in the access file, add the domains you want to accecpt from, and block all ip's from the class A level (note it is a tab between ip/domain and reject/OK):


gooddomain.com OK
anotherone.com OK
1 reject
2 reject
.
.
.
254 reject



makemap hash /etc/mail/access

restart sendmail...


Rgds...Geoff

[Dave Olker]

I looked in the O'Reilly sendmail book - Second edition - and found on page 289 there is a heading called "Accept Mail Only From Our Domain." It may provide the feature you're looking for.

Good luck,

Dave

[Steven E. Protter]

Goeff's solution will work just fine for you.

You'll need a macro script for HP-UX to build your sendmail.cf file.

http://www.hpux.ws/buildmail.hpux.text

You will cut down a lot on your spam.
I wish I could do that.

SEP