git send-email and gmail smtp

so I tried to submit a patchset via sendemail,
and ran aground on authorization.

its been a while since I sent from this computer,
laptop power cord is cut :-(
but failure wording is ambiguous

5.7.8 Username and Password not accepted. For more information, go to
5.7.8  https://support.google.com/mail/?p=BadCredentials
j15-20020a0566022ccf00b007d6905cc017sm3758492iow.4 - gsmtp

Essentially, google is changing policy,
and 2FA is coming (or just arrived)

is there a well-travelled path to work around this issue?

something like ssh-key-agent ?

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