what does not allow relaying mean

[iMore Question]

I am receiving an error message when I attempt to send email. It says recipient was rejected by the server because it does not allow relaying. Why is this happening to every recipient I am attempting to send an email to?

 

[Rob Phillips]

Welcome to iMore! It sounds like you've somehow enabled email relaying through your email provider. Relaying is a method of sending large batches of emails through distribution lists. Check your settings with your email provider.