521 5.2.1 : (HVU:B1)
Site:
hi can't send any mail to our customers since 14 jan , cause this error 521 5.2.1 : (HVU:B1)
ip reputation are neutral
we updated our system
and still the same problem
i tweeted this prblm on https://twitter.com/aolmailhelp but no one answer me
so if anyone have the same issue or have any idea about this