No, did not try the E-ALL stuff, but I will.
I just got an answer from the tech service of my hosting company
When the email address does not contain "@", it is interpreted as a local address, which explains why I do not get any error message.
What I would like to know know is why I get an error on my PC when I type the wrong domain name in the email address (like "hotkail" instead of "hotmail") and not on my live system.
I use easyphp on my PC...
Thanks in advance