I&#x27;ve moved to Mutt&#x2F;OfflineIMAP on most every machine I own, and it&#x27;s worked remarkably well. It&#x27;s a CLI app, yes, but it outshines Thunderbird (and most other GUI clients, for that matter) in a number of ways:<p>- <i>FAST.</i> Mutt lets you process thousands of messages in short order. Mutt is directly responsible for helping me dig out of a 50k deep email hole brought on by years of GMail&#x27;s approach (archive, never delete) in a few days of on-and-off cleanup.<p>- Plays well with others. Uses a bog standard Maildir format that anything sane can read (including Thunderbird, so migration should be easy), provides a very powerful hooking system which can do anything from verifying PGP signatures to checking your spelling before sending to displaying attachments.<p>- Sane defaults. Doesn&#x27;t require a lot of in-depth customization to provide the basics, and the bells and whistles are hardly out of reach.<p>- You have a backup of your mail for free (by using OfflineIMAP)<p>- Not hard to learn (at least for the crowd here). If you can use Vim, you can be using Mutt at full speed in less than a week.<p>- Search capabilities that blow nearly every other project out of the water (regexes with some very cool niceties)[1]<p>- Secure by design. Mails are rendered as plaintext, HTML is decoded by piping messages through a program like w3m. Tracking bugs can&#x27;t do their job, spammers can&#x27;t see that you&#x27;ve looked at their stuff, and you&#x27;re immune to whatever image decoding bugs crop up. (Though you can still view images, it&#x27;s an explicit process). Also, builtin GPG support.<p>I followed Steve Losh&#x27;s guide[2] on setting it up.<p>[1]: <a href="http:&#x2F;&#x2F;www.mutt.org&#x2F;doc&#x2F;manual&#x2F;manual-4.html" rel="nofollow">http:&#x2F;&#x2F;www.mutt.org&#x2F;doc&#x2F;manual&#x2F;manual-4.html</a><p>[2]: <a href="http:&#x2F;&#x2F;stevelosh.com&#x2F;blog&#x2F;2012&#x2F;10&#x2F;the-homely-mutt&#x2F;" rel="nofollow">http:&#x2F;&#x2F;stevelosh.com&#x2F;blog&#x2F;2012&#x2F;10&#x2F;the-homely-mutt&#x2F;</a>