Email address spoofing

Alex Neuman van der Hans alex at
Thu Oct 2 18:17:57 IST 2008

Exactly. If they're using someone else's mailservers there is nothing  
to do.

Stop them from using another server if you really want to solve the  

If your users say "but I can't connect to your server" help them out  
by using port 465 and port 587 (with and without SSL). Port 25 is not  
a prerequisite; in fact, it should be discouraged unless you're a  

On Oct 2, 2008, at 11:59 AM, Maxime Gaudreault wrote:

> 2. My mail server already uses authentication. But my customers uses
> their ISP's mail server... not mine.
> 3. I'm not sure I understand but if they don't use my outgoing  
> server, I
> can't signs the emails..

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