Sending Mail via Gmail using OAuth2 (2022 Edition)

Sending Mail via Gmail using OAuth2 (2022 Edition)

Update: Google's OAuth2 turns out to be not a good way to send mail, because passwords have to be renewed weekly. So you probably want to use a GMail App Password instead. I'm leaving this article up in case there's some reason someone would actually want to use OAuth2 with GMail.

There's been lots of talk on mailing lists for various mail programs, like Alpine and Mutt, about Google's impending dropping of password access.

Although my regular email address is on a Linux server, I subscribe to several Google Groups. I use a gmail address for those, because Google Groups doesn't work well with non-gmail addresses (you can't view the archives or temporarily turn off mail, and unsubscribing may or may not work depending on the phase of the moon).

I prefer not to have to sign on to Google and use the clunky browser interface when I have a perfectly good mailer (I use mutt) on my computer. I send mail from mutt using a program called msmtp. But to post to a Google Group, I need to use Google's SMTP server. (SMTP is the Simple Mail Transfer Protocol, the way mail gets from one computer to another across the internet.)

Up to now, I've been using an msmtp configuration that includes my Gmail password. That requires clicking through several Gmail pages to enable the "Less Secure Apps" setting. Google resets that preference every month or so and I have to go find the "Less Secure Apps" page to click through the screens again; but aside from that, it works okay.

But now Google has announced they'll be removing support for password access on May 30, 2022.

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