Mail to hotmail.com are being failed
807574Nov 13 2007 — edited Feb 11 2020AA ,
I have been receiving serious problems in my mail server; " All mails directed to hotmail.com are not being sent " , Mails to other domains are being sent successfully. the error i receive is
Temporary error turned by SMTP partner.
451 Timeout waiting for client input
Can anyone explain this error and advise what should i check. I see that dns is resolving it correctly.