If you are not sure, send your complaint to Postmaster. Unfortunately there are a few networks out there who allow spammers to continue spamming from their servers. This means that other networks can deny spam friendly networks access to certain parts of the internet and protect there users from spam orginating on these servers. If you receive spam, get the real address and check to see if it is a known spammer. If the check returns not listed then all you can do is mail the postmaster.
Every network has there own policies regarding spam and how to treat spammers.
Some networks have set a magic number, say 20, and if anyone sends out 20 or more of the same message they may be considered a spammer. Other networks don't bother to track numbers of emails but consider a user to be a spammer any time the network receives a complaint about unwanted email. Avalon Networks, Inc. will not tolerate spam. We strive to protect our users the best that we can from unwanted email. We want to provide the best service possible which means we can not allow spammers to eat up our bandwidth with spam mail.