Thunderbird-HG email scam // cache accelerator

[rankoo]

Thunderbird thinks that all HostGator emails I received (registration info, sales, billing etc) are email scams.
I use a forum on my site. All forum message are seen as email scams as well. (x-antiabuse headers, and email scam notification).
Why?

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My forum supports caching through the use of accelerators.
The currently supported accelerators include:
* APC
* eAccelerator
* Turck MMCache
* Memcached
* Zend Platform/Performance Suite (Not Zend Optimizer)
My previous hoster had the eAccelerator.
The forum did not detect a HG accelerator.
Has HG a cache accelerator?