553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)

I

isaac

I keep having this message when I send emails. The pop and
smtp are different.
Thank for your help
553 sorry, that domain isn't in my list of allowed
rcpthosts (#5.7.1)
 
L

Lanwench [MVP - Exchange]

Are you set up to authenticate to your SMTP server, if your ISP requires it?
 

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