Update at 19:50 (Ireland's time)
Mail flow is restored and the queue is being digested.
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Dear customers,
We are currently experiencing some mail processing delays on us3-smtp-ui.titanhq.com which we are actively triaging at the moment.
We will update with our findings in due course and sincerely apologise for the inconvenience,
Thank you for your patience and consideration at this time
UPDATE 16:22 ET US: The mail queue is coming down, and should be cleared w/in the hour.
UPDATE 16:49 ET US: The mail queues have been cleared.
--- we apologize again for the inconvenience.