How to NOT add addresses automatically

I recently got this email:

My problem isn’t deleting addresses but not adding them. I seem to have Tbird set such that any new replies get added to the address book. I’d rather put all new entries in manually (mostly because ‘m a lecturer and don’t need all my students’ emails in my address book). I can’t seem to find a way to unset this. Can you help?

After poking around, I think I found what you would need to stop adding entries to your address book automatically.

1. Open Thunderbird
2. Go to:
   1. On a Mac: Thunderbird > Preferences
   1. On Windows: Tools > Options
3. Go to the Composition tab
4. Uncheck that last checkbox that says “Automatically add outgoing e-mail addresses to my:”.

This should stop adding addresses to your Collected Address or Personal Address Book when you reply to an email.

How to spell check messages

Thunderbird has a great little spell checker built-in and it’s actually turned on by default. Let’s say for whatever reason, your’s isn’t on and you want to stop embarrassing yourself with your poor spelling. There ‘s a simple fix:

1. On a Mac, go to Thunderbird > Preferences; on a PC go to Tools > Options.
2. Go to the Composition tab, then the Spelling sub-tab. You have two options for spell checking: “Check spelling before sending” & “Enable spell as you type”. The first one checks the spelling in the email after you hit “Send”, and alerts you to any typos. The second one actually underlines typos with a red squiggily line.
3. Just check both of those options (for spelling safety) and you’re good to go!

How to change how messages are forwarded

When messages are forwarded from Thunderbird, by default, they are sent as an attachment to the new message. If, like me, you prefer that the forwarded message be sent inline (as in readable at the bottom of your new message), then you’ll need to change the default setting. Here’s how:

On a Mac, go to Thunderbird > Preferences; on a PC, go to Tools > Options.

Go to the Composition tab, the General sub-tab.
The first option at the top deals with how messages are forwarded. Switch that setting from “As Attachment” to “Inline”