email

[susu]

A lot of my valid email gets put into spam.  Is this likely Kaspersky or Xfinity?

[Schulte]

Hello @susu, Welcome.

Which mails are you talking about? Do your sent mails end up in spam or the ones you receive?
Is Xfinity your internet provider?

[Igor Kurzin]

Hi @susu, 

Is there a label [!! SPAM] added in the emails subject? You can set a different custom label to trace spam detections by Kaspersky: 

Replace [!! SPAM] with anything else to your taste.

Does the detection issue persist if you disable Kaspersky Anti-Spam component? If yes, it is Xfinity then. If not: 

Try adding the senders to the allowed sender list, will it help?