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Usually I get very little amount of spam. I have a very good anti-spam setup, which I will describe some time in future. Normally I do not get any spam at all. But recently Istarted to get 2-3 spam messages a day. Not a big deal but annoying. I usually check all such messages to see where they come from. And currently all of them have headers like:
Received: by fk-out-0910.google.com with SMTP id b27so1193048fka.0
for <xxx@xxx.lv>; Sat, 17 May 2008 12:46:34 -0700 (PDT)
Received: from ?88.183.182.56? ( [88.183.182.56])
by mx.google.com with ESMTPS id n10sm10053043mue.14.2008.05.17.11.51.06
(version=SSLv3 cipher=RC4-MD5);
Sat, 17 May 2008 11:51:57 -0700 (PDT)
Message-ID: <40401143530703.C0305F9608@WX6U>
It looks like 88.183.182.56 (located in Paris) connected to mx.google.com and sent this message. However, mx.google.com cannot be resolved through DNS. SpamCop thinks that mx.google.com is GMail's server). However message id does not match to GMail's. The adress where these messages are sent is one of my private addresses in ".lv" zone, so has nothing to do with Google or GMail. In the end it means that spammers found a way to use Google mail servers for spamming.
This is bad because lots of people use GMail now and eliminating this spam will be difficult.
UPD: found this information.
UPD2: another bad thing about Google mail servers. Basically it is possible to send mail to whatever non-existing e-mail address using Google mail servers using forged "From" address. Google will send non-delivery notification to the forged "From" address with original spam message as inline attachment. Very disappointing...
