When I try to send an email from Windows Live Mail, I sometimes get the

error message

"The message could not be sent." "Some of the recipients for this message

are not valid"

or in German

"Die Nachricht konnte nicht gesendet werden." "Einige Empf?nger dieser

Nachricht sind ung?ltig"

However the address looks 100% correct.

I suppose it's not exactly a mail issue, but an issue with the address book.

I synchronize between Outlook, Messenger and Windows Live Mail, and I 

suppose somehow an invisible formatting error is introduced into the email 

field.

The workaround is to log off from Live (click on the upper right corner of

the main window: "Log off from Windows Live Mail") and reenter the address

manually. When I'm logged on, the address is always auto-completed, and on

the screen it looks like the manually entered one, but the autocompleted 

address produces the error, while the manually entered address does not.

The strange thing is: Even in the contacts folder, the address looks 100% 

correct. The only thing I can imagine is, that somehow

'john doe (john_at_doe.example)' is considered to be the email address rather 

than 'john doe' being the real name and only 'john_at_doe.example' being the 

email. This would explain why it looks identical on the screen, but in fact 

is very edifferent. It would also explain that the message pops up 

immediately because this would be a very obvious syntax error in the email 

format, which can be detedted without contacting the server.

My OS is Windows 7

Does anyone have the same issue or even a solution?