Chose AppRiver from OpenText
AppRiver requires the least amount of management time, the pricing is better and the minimums are such that almost all SMB's won't be buying shelfware. If you are an MSP, become a partner and you will see spam problems become a thing of the past.
Independently Invited by TrustRadius
A de minimis incentive was given to thank the reviewer for their time. The incentive was not used to bias or drive a particular response, nor was the incentive contingent on a positive endorsement. More Info