Howto stop spammers from sending anything@domain.com ... although the domain has no e

You cannot "stop" the spammers from sending mail to invalid accounts ... but you can put measures in place to insure this type of mail does not waste server resources and is quickly refused at the time of server rcpt.

You should find information on the links below helpful:

http://www.configserver.com/free/fail.html

http://www.configserver.com/free/eximdeny.html

 

if it's the bounces that are a bother, disable catch all by setting default ID to :fail: no such user here