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I really should give imapfilter, offlineimap, msmtp, and neomutt a try. Claws Mail is OK, but still graphical and its configuration probably isn't easily version-controlled.
https://jason.the-graham.com/2011/01/10/email_with_mutt_offlineimap_imapfilter_msmtp_archivemail/
@starbreaker
Claws-mail's config files are stored in ~/.claws-mail, in various INI-style [item]rc files. The most important of those are clawsrc and accountrc. If you use its addressbook that's in XML files in ~/.claws-mail/addrbook.
How simple that would be to put into version control and whether or not it would be worth the effort is entirely up to you.
@ND3JR Thanks for the info. It's good to know, though I'll probably switch to either mutt or alpine so that I have one less gui app to depend on.