You can use a chrome folder adding it to the root profile default of TB. Chrome should contain a css file and the desired icons.
Thunderbird chrome not working
If even after adding chrome folder thuderbird doesn’t use your cutomized css, you should try with:
Settings/Options > Advanced > General > Config Editor
toolkit.legacyUserProfileCustomizations.stylesheets > true
A Workaround for the Default Gmail “From” Rewrite
Google automatically rewrites the “From” field of any e-mail you send through its SMTP servers to the default address set up in your Gmail account, even if you don’t send the mail directly from Gmail. If you’re not careful, this can tarnish your business image. This small quick fix has to be done before you start sending e-mails to help you keep your branding consistent.
Start by signing into the Gmail account you use with Google SMTP. Click the gear icon in the top left corner, then choose Settings. Select the Accounts and Import tab. Look at the Send mail as section and make sure you have more than one e-mail address set up. If you don’t, add another account, preferably one personalized with your business branding. Now simply make this your default account; Google’s SMTP will automatically rewrite the From field using this address instead of your Gmail account. It’s that simple!
android mail app
K9-Mail is a good app, but unfortunately rarely updated, in the last year. Besides, it has had an annoying cryptography bug and a notification bug.
So we tried FairEmail, that is definitely more accessorized, but not really privacy-friendly as they pretend, and not so open source: impossible to contact the developer, and pro functionalities are blocked until you pay something.
So, we went back to K9-Mail, that is absolutely open-source, even more “spartan”, but in its latest release without cryptography bug and notification bug.
choose the browser to open a given link with
In Thunderbird you can use the “Open With Options” add-on, which let you choose with what browser you want open a given link in a given e-mail.
You can add new browsers as well, in a very easy way.
eliminare da thunderbird indirizzi sbagliati
Si veda questo thread.
Ricordarsi poi di sincronizzare con Google contacts (se l’avete).