View source for Not a valid email address because it is not of the form user@host

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This error message can occur if you're trying to use email addresses without a domain such as <lastname.firstname> on a corporate internet. Thunderbird expects the full email address.

The normal workaround is to use the [https://addons.mozilla.org/extensions/moreinfo.php?application=thunderbird&numpg=10&id=2030 Allow Local Addresses] extension. That seems to be the best solution if your SMTP server isn't a normal Internet mail server.

You could also use the [[Modify_Thunderbird_settings | Config editor]] and set the preference mail.identity.default.autocompleteToMyDomain  to true. You could also replace "default" with an identity specifier (for example, id3) to make settings that are specific for certain identities. [http://forums.mozillazine.org/viewtopic.php?t=626926]

==See also==
* [[Extensions_%28Thunderbird%29 | Extensions]]

==External links==
* [http://ilias.ca/blog/2005/11/auto-complete-email-address-with-default-domain/  Auto-complete email address with default domain]
* [https://bugzilla.mozilla.org/show_bug.cgi?id=312818 Bug report - Thunderbird requires domain in addresses and doesn't always add default]
[[Category:Issues (Thunderbird)]]
[[Category:Composing messages (Thunderbird)]]