[exim] Error 5.5.2 : Invalid data in message

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Autor: lista_exim
Data:  
Dla: exim-users
Temat: [exim] Error 5.5.2 : Invalid data in message
Hi!

I have this problem with some mails sent from Thunderbird, when the
message has an attachment with a name longer than 50 characters. Any other
client (Outlook, ...) has not the same problem.

If I use another SMTP server (GMail, Yahoo, etc), I can send the same
messages without problems.

What can be the problem with my SMTP server?