Error 5.1.1 when trying to send email to an ailias

[b33vor]

Hi all,

I'm a bit of a novice to this, but am working it out, but am having problems with one of my aliases. I have my main account, which can send and receive fine, 1 alias which can send and receive fine but another which is having a recurrant error, but it has worked previously. Basically, there wasn't this error, then there was. Any help much appreciated.

thanks,
Tom