Either you need a different pop up blocker or you have certain sites that you have allowed pop ups in the past. Check in your setting to see if you have allowed sites.
A spam popup blocker prevents ads from popping up in new windows on a users browser. The spam popup blocker first appeared on the internet scene in the mid 1990's.
add att.net mail to popup blocker's list.
To obtain the Barracuda Spam Blocker you can go to the Barracuda Networks website and go to their product page. Then you can choose a free 14 day trial or buy it for $699.
JavaScript maybe
Namo CyberFence 2.0 is a Popup Blocker product from namo.com.
Use Popup Blocker in your browser[tools/Settings]
To override a popup blocker in most browsers, you can typically hold down the Shift key while clicking on a link. Alternatively, you can also try holding down the Ctrl key (or Command on Mac) while clicking. This may allow the popup to open despite the blocker. However, the exact method can vary depending on the browser and its settings.
Open Internet Explorer. Then click Tools>>Pop up blocker>> Turn on pop blocker
Make sure you have a program that has popup blocker and make sure it is on.
Probably because your computer is not protected by anti-popup blocker,
A popup is a window or advertisement that appears on your screen while browsing the internet. This tends to happen more in Internet Explorer. Popups can be rid of by installing a Popup Blocker.