I think you migrated your site to Namecheap recently.
@thehammadone your domain used to be hosted on another cPanel server (
pune.viewen.com), which still has your Let’s Encrypt certificate available on it.
What’s happening is that AutoSSL is still running on
pune.viewen.com, because it hasn’t realized that your site is now hosted with Namecheap.
What you should do is just make sure your account is removed from your old hosting, and you will stop receiving those AutoSSL warning emails.
@stevenzhu is right that Namecheap does not enable AutoSSL on their servers, and this explanation is consistent with the information you’ve provided.