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I'm using web based outlook 2013 and I want to change the content-type form 'multipart/alternative' to 'text/plain' because some mailing list forbid the first choice.

fatal: Sorry, I don't accept messages of MIME Content-Type 'multipart/alternative' (#5.2.3). Sorry, for security reasons this list only accepts plain text email and no large attachments. Please configure your mail client accordingly

So, any ideas about how to change the content-type?

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When you are logged into Outlook.com, create an email. At the top there is an Option button. Click that and choose plain text.

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There is not an option to always have Outlook.com do this, so you will have to change it manually for those messages you want in palin text.

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  • thanks alot it worked, I will mark the question as answered Now
    – Nidal
    Jun 3, 2014 at 17:53
  • But that only allows it to be set to text/plain, not an arbitrary MIME-Type. Sep 28, 2023 at 15:19

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