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The blocking to AT&T that was occurring has been resolved. If you are still having in an issue please contact support.
We have been made aware that starting yesterday there was a small subset of senders that were affected by a blocking of email to AT&T owned systems which has grown today. We have an opened a High severity issue and our engineers are investigating the cause of the issue. Additionally we have requested a delisting of the IP's affected with AT&T.
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