weired logs

["Hans-J. Ullrich" <hans.ullrich@loop.de>]

Hi all, 
just a question. I found this entry in my logs:

Nov  7 21:02:21 protheus2 check[7476]: [ 3] Unable to connect to 
c105.cloudmark.com:2703; Reason: Connection refused.
Nov  7 21:02:21 protheus2 check[7476]: [ 3] Unable to connect to 
c105.cloudmark.com:2703; Reason: Connection refused.
Nov  7 21:02:25 protheus2 check[7476]: [ 3] Unable to connect to 
c105.cloudmark.com:2703; Reason: Connection refused.
Nov  7 21:02:25 protheus2 check[7476]: [ 3] Unable to connect to 
c105.cloudmark.com:2703; Reason: Connection refused.

It looks like my host tried to connect to c105.cloudmark.com port:2703.

I never tried to do this, so this might be caused by an application (which 
might be a security hole), someone attacked me, or this was caused by my 
running tor. What is port 2703 ? 

Regards

Hans