Formatting announcement mail

Hi - I’m new to announcement lists.
I’m having trouble sending html formatted messages.
What’s the easiest way to type up a simply formatted message and sent through the announce list so that it actually arrives as formatted text?
I’ve managed to do this once, but when I tried again what showed up was all the text and all the code.
help appreciated.

I am not use announcement mail. But you may want to check whether you have enabled html text

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