Mail list - problems receiving

[Gareth Bailey]

I am now using free webmail to post to the list, since for
some reason i cannot post to the list from my real email
address (freebsd at ubersoft.co.za), i can only receive
mail messages. mailq has this to say:

{D3EBF4E        3377 Sun May  9 16:31:31
 freebsd at ubersoft.co.za
(host mx1.freebsd.org[216.136.204.125] said: 450 Client
host rejected: cannot find your hostname, [xxx.x.xx.xx] (in
reply to RCPT TO command))
                                         freebsd-questions at freebsd.org}

What should i do?

Many thanks
Gareth
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