My thread got responses from Thomas de Groot and others, but while I can
easily start a thread, i cannot answer to anyone. Each time i try to
respond, I get the following error message:

____________________________________________________________
An error occurred while sending mail. The mail server responded:
5.7.1 <XXX### [at] yahoocom>: Sender address rejected: illegal sender domain.
Please check the message recipient "XXX### [at] degrootorg" and try again.
____________________________________________________________

(With the "XXX" I replaced the original e-mail addresses.)
I use the Mozilla Thunderbird as e-mail client. What do I have to
change? Help needed. i want to be able to communicate again with everyone.

Sven

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