aerc can defer to sendmail for the delivery of outgoing messages.
In accounts.conf (see aerc-config(5)), the following sendmail-specific options are available:
This should be set to the path to the sendmail binary you wish to use, which is generally /usr/bin/sendmail. aerc will execute it with a list of recipients on the command line and pipe the message to deliver to stdin.
Maintained by Drew DeVault <email@example.com>, who is assisted by other open source contributors. For more information about aerc development, see https://git.sr.ht/~sircmpwn/aerc.