Email spamming prevention

m_sree · 01-14-2003, 11:26 PM

I am having a bastion server and a mail server inside in my private network. Then MX points to the bastion server and the bastion forwards all mails to the mailer server in the intranet.

I want to set up aliases in my mail server which sends mails to a group of members. This is required as an internal requirement. How can I prevent outsiders sending mails to these distribution lists ? can I stop outsiders spamming these aliase addresses ?

Thanks
Sree

niknah · 01-15-2003, 01:05 AM

what mail server program are you using?
if your mailer uses procmail to deliver it's mail locally you can do that.

m_sree · 01-15-2003, 12:23 PM

I am using sendmail..

Sree

niknah · 01-15-2003, 07:49 PM

instead of adding an alias, setup a normal account and in the normal account, add a .procmailrc file...

:0
* ^(from

.*(mydomain\.com)
! user1,user2,user3

:0 E
! null

replace user1,user2,user3 with whatever users are in that group.
replace mydomain.com with your domain
and "null" is some address you want the rejected emails to go to.

unSpawn · 01-16-2003, 08:54 AM

How can I prevent outsiders sending mails to these distribution lists ? can I stop outsiders spamming these aliase addresses ?
First of all, who do you define as "insiders"?

Until you reply, here's some anti spam|relay reference lists: 1, 2, 3, 4, 5, relay check.