troubleshooting Question

Can ForeFront block email domains?

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ISSit asked on
Email SoftwareExchangeMicrosoft Forefront ISA Server
5 Comments2 Solutions792 ViewsLast Modified:
This year we have moved to Microsoft Outlook (Exchange) online, we have several parents that have email addresses that are in the .pl domain and for some reason they all bounce.  We initially get the message that it is delayed and then a diagnostic message showing that it failed.  The message portion that states that " (mail159-tx2: transitioning domain of does not designate as permitted sender) see attachment made me think about Forefront as that is the only filter I know in the system.
Does anyone have any ideas, when I look in Forefront, I do not find anything that would cause this, though admittedly I am not very familiar with the software or its interface.
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