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With Windows Firewall enabled (turned on) on Windows Server 2008 my 3rd party application (3ware RAID controller interface) can't send email notifications - Basically, in the settings, i configure SMTP server, user, password etc...

When i turn off windows firewall, it can send it fine...

Which setting in Windows Firewall would be preventing this?

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Add each application to the firewall's allowed list.

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up vote 0 down vote accepted

I added port 25 to the exceptions list and all seems good.

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I also experienced issues with SMTP outbound traffic and found that it was caused by the virus scanner killing the connections, :|

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