I am suddenly getting thousands of spam emails a day for the last week.

i'm getting replies from this forum in the webmail spam folder.

fwiw, i use no spam filtering!!

You said that in this post 4 days ago.

Do your Spam Settings look like this?

Did you check your Filter Rules to verify you don't have a rule to file email from cox-notification@coxforums.com into your Spam folder?

Ways for Spam to get into Webmail Spam folder

• Set Spam Settings to: "Automatically deliver to Spam folder" (not default).
• Create Filter Rule to file email from a specified address into Spam folder.
• Open an email and manually select "Mark as Spam".
• Manually move email to the Spam folder.

There appears to be a discrepancy in what you're saying or omitting.  You've indicted Spam Settings are set to "No Spam filtering".  For email to be in the Webmail Spam folder, some other user action had to have been taken.

How are Forum notification emails getting into your Webmail Spam folder?