I am a systems admin for an accounting firm of about the size of yours, and I used to use GFI's mail filtering software plus others to try and filter spam onsite. It quickly became apparent that it costs more in my time to care of this, monitoring and tweaking, than it does to outsource. I came across a firm called Inbox Genius, which is part of MailFoundry who are different in that they only charge for email addresses they filter. Out of our 50 employees only about 20 actually have a problem, so we filter those only. The first 10 are free so it costs us less than $10/mo. Therefore, if you are spending more than a half an hour a month messing with this then it is wasting the firms time and money.
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I am a systems admin for an accounting firm of about the size of yours, and I used to use GFI's mail filtering software plus others to try and filter spam onsite. It quickly became apparent that it costs more in my time to care of this, monitoring and tweaking, than it does to outsource. I came across a firm called Inbox Genius, which is part of MailFoundry who are different in that they only charge for email addresses they filter. Out of our 50 employees only about 20 actually have a problem, so we filter those only. The first 10 are free so it costs us less than $10/mo. Therefore, if you are spending more than a half an hour a month messing with this then it is wasting the firms time and money.