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Sophos has received reports from some customers experiencing problems sending out emails to a large number of bulk recipients.
A similar bounce back may be seen from the sender before February 12th at 15.00 UTC.
554 5.7.28 Mail flood detected;
The following notification may also be seen on the administrator dashboard:
As of 15:00 UTC February 12th, 2020, the thresholds have been reverted.
In preparation of the rate-limits being introduced, bulk email senders can request bulk sender privileges to high volume mailboxes.
Under Central Email > Mailboxes > Select the mailbox and click Request bulk sender privileges and fill out the request form.
This article will be updated when information becomes available.
Thanks for the notification before turning this on - NOT!
What's the turnaround time on the request - been > 4 hours and still status pending.
What constitutes a bulk load? We snagged on < 25 invoices sent out this morning - 8 rejected with Mail flood detected error.