Translations:Claws Mail/4/en
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It is in active development, can be extended by many plugins, and allows importing of mbox-format mailboxes (coming from Thunderbird, for example). Its native mailbox format is wikipedia:MH Message Handling System, although the mbox format can be used with a plugin. Claws Mail cannot write HTML messages (in keeping with the Keep It Simple principle), but can read them using plugins.