ISP is blocking us from using their smart host, they think we are spamming.

Our ISP is blocking us from using their smart host a few times these days. They told me that one or some of our computers were infected and spamming. I checked Trend Micro console, but have not seen any viruses so far.
We migrated from SBS2003 to SBS2011 a few days ago. And our ISP blocked us from using their smart host on the very next day. Ever since then, this has happened 3 times in a week.
If I use our own server to send out emails, some recipients will reject because of their spam filtering system.
Any thoughts, suggestions??
Thanks in advance!

On your network firewall, you can block outbound SMTP (25) for all of your network systems and create an allow outbound SMTP (25) for your server. Thus if a workstation is trying to send direct to the internet your firewall should prevent the communications
but it will allow your server to send mail out to your smarthost. If your firewall can support unified threat protection, enabling such services will aid you in assuring yourself and your ISP of the clean bill of health for your messaging environment.
You can also force a password change on all of your user accounts as a preventative measure. If you were dealing with ISP mailboxes or an external provider, this would be where the vendor would start.
You should also be able to get support from your ISP; if they are blocking your connection they must have some information to work with that will help you narrow your approach. Another option would be to look into third party smarthost/sanitation services
such as Forefront Online Protection for Exchange which can certify your email and can allow you to bypass your ISP. Usually an ISP offers a free smarthost service but what you get in return is entry-level service, but if you pay for outbound smarthost
services, you get a service level and support agreement.
Hope that helps,
-Jason
Jason Miller B.Comm (Hons), MCSA, MCITP, Microsoft MVP

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