To send HTML emails from Horde webclient, please follow the following steps :-

1) Log in to your Horde webmail client.

2) Click the [New message] button.

3) In the "Message Composition" window that opens you will see the option [Switch to HTML composition].

4) Click it and a WYSIWYG editor will open, giving you the option to edit your text's font, size, format, to insert links and images, etc.

5) Once you are ready with the message, click [Send Message] to send it.

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