Teach Mutt yet another trick: how to filter messages in your Inbox with a simple macro.
I'm a longtime Mutt user and have written about it a number of times in Linux Journal. Although many people may think it's strange to be using a command-line-based email client in 2018, I find a keyboard-driven email client so much more efficient than clicking around in a web browser. Mutt is extremely customizable, which presents a steep learning curve at first, but now that I'm a few decades in, my Mutt configuration is pretty ideal and fits me like a tailored suit.
Of course, as with any powerful and configurable tool, every now and then I learn of a new Mutt feature that improves my quality of life dramatically. In this case, I was using an email system that didn't offer server-side filters. Because I was a member of many different email groups and aliases, this meant that my Inbox was flooded with emails of all kinds, and it became difficult to filter through all the unimportant email I wanted to archive with the emails that demanded my immediate attention.
There are many ways to solve this problem, some of which involve tools like offlineimap combined with filtering tools. With email clients like Thunderbird, you also can set up filters that automatically move email to other folders every time you sync. I wanted a similar system with Mutt, except I didn't want it to happen automatically. I wanted to be able to press a key first so I could confirm what was moving. In the process of figuring this out, I discovered a few gotchas I think other Mutt users will want to know about if they set up a similar system.
The traditional first step when setting up a keyboard macro to move email messages based on a pattern would be to use Mutt's tagging-by-pattern feature (by default, the T key) to tag all the messages in a folder that match a certain pattern. For instance, if all of your cron emails have "Cron Daemon" in the subject line, you would type the following key sequence to tag all of those messages:
That's the uppercase T, followed by the pattern I want to match in the subject line (Cron Daemon) and then the Enter key. If I type that while I'm in my Mutt index window that shows me all the emails in my Inbox, it will tag all of the messages that match that pattern, but it won't do anything with them yet. To act on all of those messages, I press the ; key (by default), followed by the action I want to perform. So to save all of the tagged email to my "cron" folder, I would type: