Mimecast email blocking

Are emails from OnSIP getting blocked or delayed in receipt to Mimecast?  This is what a few of our customers with the same issue did and provided to OnSIP to share with our customers:


From mimecast to OnSIP customer...."To prevent this from occurring, you'll want to go ahead and create a message pass through policy. This can be found under:
Administration > Gateway > Policies > Message Pass through

Use the from address for the messages to be delivered successfully. For best results, use the domain in the Specifically field for domain. We occasionally change or modify email addresses.

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