Sending mail from one user to another fails with "missing domain" erro

Posted by 52n on Mar 18, 2013; 10:08am
URL: https://support.nabble.com/Sending-mail-from-one-user-to-another-fails-with-missing-domain-erro-tp7583619.html

When a user tries to send an e-mail to someone else who send any message with a signature containing an e-mail, he receives a error message:
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Send Email to [hidden email]

Missing domain

Please fix the error and try again.
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Is there any configuration switch to fix this?