- Standard spellchecking with the ability to change between dictionaries
- Integration with most webmail services like Gmail, Hotmail and Yahoo
- Enhanced spam protection
- Styling through themes
- Extensible through plugins which makes it possible for the community to add almost any feature.
Delayed sending of e-mailWhen pressing send in Outlook Express, then the e-mail will be placed in the Outbox, and the next time it synchronizes with the mail-server then it will be sent. Thunderbird will immediately send the email, so if used to be able to edit a sent e-mail by going to the Outbox then you will be disappointed.
MagicSLR can replace the Send button with a Send Later button, which places the email in the Unsent folder.
Reply and forward header are awfulWhen replying to a mail then one doesn't get the pretty header showing the details of the message replying to. Instead one get the following:
TB Reset Quote Header Extension (Change Quote / smarttemplate4) can create a reply-header based on templates files quoteHdr.txt and quoteHdrHtml.txt.
Reply will perform quote with indent characterThere is no option in Thunderbird to disable indent of the reply quote or change the indent character. This can lead to quite obscure emails when replying back and forth between two e-mail clients each with their own idea of how to indent.
QuoteAndComposeManager can remove the indent character when making a reply.