attempt to do what is called deliverabilty testing, where they
attempt to break current spam rules that vendors have in place. No
spam software is 100% effective against this, and spammers will
find a way to break rules, hence why rules are constantly updated.
Recently, spam activity has increased in regards to spammers using
standard phishing techniques for more targeted attacks. These
attacks usually appear to contain a bad virus attachment and the
FROM address appears to be at your domain. As a reminder, please
make sure to adhere to common anti-virus
safety tips. These messages are caught shortly after
release, and our spam engines are being updated to stop these
going forward, along with some variants. However, these persistent
spammers are mutating their messaging and viruses enough to get
past the current spam definitions, and we are constantly updating
our definitions to stop these as quickly as we can.