533 sorry that domain isnt in my allowed hosts (#5.7.1) ? help

[Guest]

Hi am using outlook and I can receive mail but cant send except strangely I
can send a test to myself.

Keep being told that the intended domain isn't in my list of allowed
rcphosts (#5.7.1)

Any ideas

Cheers

 

[Roady [MVP]]

In your account settings press More Settings... and enable your SMTP server
to use authentication.