Mapping external email addresses to a different internal domain


 I've setup a test domain as Several months ago I purchased a domain name (i.e. Whilst I can ring my ISP and get them to create an MX record for to point to my ip - the problem I have is with email.

 Currently as I send an email out, it reaches it's target, but the reply to abc fails - I'd like to setup a mapping so that internally I can keep address, but to the outside world I'm using

 Re-creating the domain seems excessive, am currently looking into renaming the domain. Any ideas much appreciated.

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