Unwanted mail from Users (Backscatter mail)

2015-02-07 Thread Alamgir Shamim
Hi, We have an ISP. We have lots of users. They use our smtp server to send mail. Very often we are facing a problem. Sometimes huge unwanted mail comes from our users to smtp server who are basically behind nat IP and make our smtp server's IP listed in many black list sites like SORBS and

Re: Unwanted mail from Users (Backscatter mail)

2015-02-07 Thread Robert Schetterer
Am 07.02.2015 um 20:05 schrieb Alamgir Shamim: Hi, We have an ISP. We have lots of users. They use our smtp server to send mail. Very often we are facing a problem. Sometimes huge unwanted mail comes from our users to smtp server who are basically behind nat IP and make our smtp server's IP

Re: Unwanted mail from Users (Backscatter mail)

2015-02-07 Thread Wietse Venema
Alamgir Shamim: Hi, We have an ISP. We have lots of users. They use our smtp server to send mail. Very often we are facing a problem. Sometimes huge unwanted mail comes from our users to smtp server who are basically behind nat IP and make our smtp server's IP listed in many black list