Mail Gateway 
Typical server can receive ~500,000 emails per day. Each
of those 500,000 emails has to be checked twice (by both spam and virus
filter). Server has to run 1milion processes per day JUST to
complete email filtering. Spam and virus filters are the key perpetrators
for increased server loads, unstable servers and ultimately slow and
inaccessible websites.
To solve this issue we've now setup a Mail Gateway. That's a seperate
server dedicated to only checking emails for spam and viruses. In
other words, the server where your website is hosted is relieved of
having to run 1million processed a day. This in result makes your
website alot faster and significantly more stable and reliable. All
hosted accounts have access to this feature.
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Truth about spam filters
There's no such thing as the 100% effective spam filter that won't lose
valid emails in the process. No matter how the host calls their spam filter "state-of-the-art" or
the "newest technology" the truth is, 99 out of 100 spam filters
work on the exact same principle. The only difference is how high/low
is the spam TOLERANCE level set to. High tolerance = no spam + loss of
valid emals. Low tolerance = higher spam + no loss of valid emails. It's
about striking the balance between reducing spam and getting valid emails.
Our spam filter
By consistently monitoring and readjusting the tolerance level we struck
the optimal balance. With our spam filters you will not completely eliminate
spam. You will reduce it to the bare minimum needed to insure those valid
emails are not filtered out in the process.
'Possible Spam' Feature
Another great feature is that the filter will mark all suspicious emails
'POSSIBLE SPAM'. 98% of the time those emails will turn out to be spam.
You can setup a "Possible Spam" folder in your emails client
so that all the leftover spam is being collected in that seperate folder.
Similar to Yahoo, gmail TRASH folder. This way you still get to keep your
inbox clean AND make sure all valid emails are all delivered.
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