This has been going on for weeks, we have changed settings as advised been patient test still emails sent to our customers that use Bt internet accounts are bouncing back to us.
CAN WE PLAESE GET TO THE BOTTOM OF THIS.
Thanks.
sample of return with email blanked out
----- The following addresses had fatal errors -----
[Status: Error, Address: <
-------------------------------
>, ResponseCode 421, Too many messages (1.5.6.2) from 74.201.84.163]
Message will be retried for 4 more day(s)