Raw HTML code appears to people receiving Outlook emails

Question

Replies to emails on a mailing list from me show HTML code at the bottom. This only occurs when sending via Outlook. It doesn't matter if I reply using HTML or plain text.

See below:

Replying to Bob.

On Wed, Jul 5, 2023 at 2:59 PM bob@b wrote:
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X-NCJF-Version: 6
Precedence: Bulk

Answer 1

It's a mail list server. An organization I belong to subscribes to it. The problem occurs when I send an email to that list.

Answer 2

Hi @Robert Walter ,

Thanks for your reply!

If you are sending email in Rich Text format, it's suggested that you could select the below option via File>Options>Mail>Message format to check if there're any differences.

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Answer 3

The suggestion was NOT helpful. The problem persists regardless of the format I select for the outgoing email. The code still appears at the end of the message. This does not happen with other mail clients.