Koozali.org: home of the SME Server

Obsolete Releases => SME Server 9.x => Topic started by: bosco555 on November 04, 2015, 05:08:49 AM

Title: email from non-existing user/s
Post by: bosco555 on November 04, 2015, 05:08:49 AM

Hi All, lately we've been receiving spam email from non-existing users of our domain to our inboxes. is there anything that can be done to curb this?
thanks
gb

Title: Re: email from non-existing user/s
Post by: janet on November 04, 2015, 06:48:42 AM

bosco555

I am seeing this also. Make sure your users do not click on the attachments, & make sure you have a good & active virus scanner monitoring your workstations.
We mortals have to wait until the RBL lists & Spamassassin can manage this type of rubbish.

Title: Re: email from non-existing user/s
Post by: bosco555 on November 04, 2015, 06:57:15 AM

HI Janet and thanks for the reply. I was reading on a exchange forum (much to my horror), that someone had blacklisted his own domain and that it worked. I have blacklisted *@mydomain.com as a test and haven't received anything coming from unknown@mydomain.com. Internal and external emails are working though..
Maybe some sort of workaround??

thanks again
gb

Title: Re: email from non-existing user/s
Post by: janet on November 04, 2015, 08:03:54 AM

bosco555

Ummm what happens when other servers use that blacklist, they will reject messages from your server/domain ???

Title: Re: email from non-existing user/s
Post by: bosco555 on November 04, 2015, 08:10:44 AM

Hi Janet,
Each server/domain will blacklist itself..so far everything is working OK and haven't received any offending emails..
In the exchange forum they explained that anything originating from the outside world with a non existent user of my domain, will be rejected...