For some reason I can't solve a problem I have with Kmail on my laptop which gives the following error every time I try to mail or reply someone.

The server did not accept the sender address. The server responded: "Invalid extension (Martin) " The message will stay in the 'outbox' folder until you either fix the problem (e.g. a broken address) or remove the message from the 'outbox' folder. Note: Other messages will also be blocked by this message, as long as it is in the 'outbox' folder The following transport protocol was used: ntlworld

Can you help me resolve this problem? I can recieve mail using Kmail, but not send a thing!!!

Regards, Bryce

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