aerc can defer to sendmail for the delivery of outgoing messages.
Basic sendmail configuration may be done interactively with the :new-account command.
In accounts.conf (see aerc-accounts(5)), the following sendmail-specific options are available:
outgoing = </path/to/sendmail>
Originally created by Drew DeVault and maintained by Robin Jarry who is assisted by other open source contributors. For more information about aerc development, see https://sr.ht/~rjarry/aerc/.