SMTP Virus Scanning Software

Can any one suggest what would be cost effective but reasonably good SMTP virus scanning software? I found one appeared good (Vexira) but costing USD 3900. I am looking at one tenth of it's cost or even for less.

I have become mad to listen to the customers call to remove all the virus at the SMTP gateway.

I am looking for low cost solutions to supposrt all the domains.

I am using sendmail as MTA.
60 domains hosted in the mailserver in a Linux Fedora server.

 

 

 

 

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