Email not sending

None of my emails are sending on my Comcast account through any app on multiple devices. It’s happening on both Android (S21) and iOS (iPad) and in every app that I have my Xfinity account installed in (Gmail, resident Apple email app, and Samsung mail).

started last night happening randomly on various apps and devices, but now it’s consistent across devices and apps.

Only able to send by logging into Xfinity in a browser. Receiving is working fine.