A reminder: both Google and Microsoft are (or already have) began the process of removing basic authentication capability for their mail services. Sending via SMTP is currently unaffected.
You are affected by this change if the following applies:
You have any JEMHC message sources connected to Google/Microsoft mail services
You are authenticating the message source connection using basic authentication (username/password)
A migration path is already provided for those affected. Please read https://thepluginpeople.atlassian.net/wiki/spaces/JEMHC/blog/2022/08/03/3517480961/Microsoft+removal+of+basic+authentication+on+1+OCT+2022 for more information.