We have an issue, although I expect it applies to anyone using email secure replies, that if the recipient replies from a dynamic IP addresses, i.e. they do not have a static IP address at home or business from their ISP, the blacklist IP check puts the email into quarantine. As this is the first check carried out for incoming email we cannot update the rules sets to allow it.
As we cannot whitelist every IP address, it has been suggested that we submit a feature request to have Secure Replies exempt from the blacklist IP check. This forum seems to be the correct method for submitting a feature request for email appliances.
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