Robert Pfister wrote:
This may seem strange for this forum, but I actually outsourced the
virus/spam filtering to an external provider. They have my MX records, and
I have SMTP locked down to only accept email from them.
Yes it is expensive, but so is my bandwidth.
I calculated that my internet connection was using between 64K and 256K
(depending on the time of day) just to through away known spam from
blacklists. Lots of spam was still getting through to the user, so I was
killing my bandwidth, and still getting user complaints.
If you can afford it, it may be easier.
Ah, but keep in mind that the external provider must know your valid
users, or you'll create backscatter. And that alone is reason for
blocklisting by many today. Even the popular spamcop blocklist accepts
backscatter as a submission criterium.
HTH,
M4
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