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email not working

ok a little bit of a long story

i signed up for hosting and got office 365 email for one year. and used it not knowing its only for one email. when i found that out i deleted my office 365 email and then reset the whole hosting server back to factory . then i made new emails using cpanel. but those emails are not working. i can send using the webmail interface but when i send the email to the address it comes up as undeliverable -- the error message is 550 Please turn on SMTP Authentication in your mail client

not sure why the SMTP Authentication will bother the receiver of the email

but any help is appreciated here.




P.S i added another domain to the server, and then setup the email for that other domain and that worked like a charm..