SendMail stopped working

I stopped receiving texts a week or so ago.
I seem to have the latest version installed, 4.01, from around August, '21.
Spectrum is internet provider.

A simple fix?

I've kind of not been into the Hubitat 'scene' because things have been working so well. I'm reluctant to re-immerse myself into it, but the text notifications have been very nice.

Thanks.

You might get better results asking in the thread for the specific app you are using. I'm guessing this one?

Sendmail - Send email and text notifications, (notification device) no local server needed - Get Help / Apps - Hubitat

Your ISP may have introduced a change to their server. The logs should show you whether they accepted the message or not, and you work from there.

will do