Once you have enabled PGP/MIME, it’s completely safe to use HTML email, attachments don’t have any problems, and it’s also safe to use flowed text for plaintext emails. If you’d like to turn on HTML email, go to the Composition & Addressing page and make sure “Compose messages in HTML format” is checked.
Note: There are valid arguments against HTML email, but it’s not a security problem, and some people hate plaintext email. If you do want to use plaintext email, you can enable flowed text by going to Preferences. In Windows and Linux it’s in the Edit menu, in Mac OS X it’s in the Thunderbird menu. From there go to Advanced, then the General tab, and click Config Editor in the bottom right. When you open it it says “This might void your warranty!”, but you can go ahead and click “I’ll be careful, I promise”.
This is the exact same thing as going to about:config in Firefox. Then you can search for “send_plaintext_flowed” and double-click the setting to change the value from false to true. And by the way, you can change all of Thunderbird’s preferences from in here too, including ones that don’t have a GUI for changing, and some of them might break everything, so be careful.
I've had people ask me why Enigmail stops their ability to send HTML-formatted e-mail, and I noticed, when walking someone else through the Enigmail wizard, that it asks to turn off HTML formatting. This is a good guide to re-enabling it, so thanks.
I always just said "If you need HTML, don't let it turn it off in the wizard." Actually, I recommend not using the Enigmail wizard at all, but generating your keys directly in the gpg command-line tool, as some of its options are broader and the implications of your choices stated more correctly. However, I argue strongly in my GPG guide that PGP/MIME will probably limit your ability to reach many people who (correctly) use GPG, and I recommend against using PGP/MIME.
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