Discussion topic: not receiving emails from one sender

This message was authored by R.J.Howbrook This message was authored by: R.J.Howbrook

not receiving emails from one sender

I'm not receiving emails from one specific sender, the rest seem to be coming through fine.


They get a bounce back code with error  '550 5.4.300 message expired-> 451 4.4.400 error communicating with frontend host or destination host - > 421 4.4.2  connection dropped due to socketerror'


i have checked filters and blocked contacts etc and they are all empty



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