Could you explain disabling ISP email and blocking the router's port 25, for us dummies? (including mac dummies, if possible.)
No problem.
The ISP email is a feature of your provider. You can go to their website, login to your ISP account and disable the email feature -if possible. The best option is to configure your premise modem/router to avoid getting hacked.
Login to your ISP modem via the web interface to it:
Bring up a blank http:// webpage. The ISP router/modems usually have a default address (from within the LAN) of 192.168.1.1. Enter that to bring up the modem’s logon page. If you haven’t changed the logon it will be the default something like Admin/Password123. If you’re unsure google it via the name of your ISP. Once you get into the router the firewall feature will have ports and/or protocols. Disable/block port 25 or the SMTP protocol if you do not directly access an email server. Web mail will be unaffected by this.
Most of all set a password on your modem/router other than the default. That’ll stop the hack mentioned in this article.