I need a solution
Please forgive me, this is my first post on this site.
I am having a problem with an email return to one of my customers. My server is a 1and1 Linux business account - shared server.
The return message he gets is the foolowing....
Rejection message:
553-you are trying to use me [server-11.tower-51.messagelabs
553-.com] as a relay, but I have not been configured to let
553-you [***.***.***.***, mail.domain.com] do this.
553-Please visit www.messagelabs.com/support for more
553-details about this error message and instructions to
553 resolve this issue. (#5.7.1)
Can anyone please kindly give advise as to what the problem is here ???