I get an error message "unable to send" when I try to upload attachments on att.net mail.
"1 File(s) can't be sent" error message comes up when I try to attach a file in Firefox when using att.net email. I am able to attach files without a problem in Internet Explorer. This is a fairly recent error message. I've tried to uninstall and reinstall Firefox and I still get the same problem. It works fine on my laptop in Firefox, but not on my desktop.
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Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
To Enable SafeMode
- You can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.
- Or open the Help menu and click on the Restart with Add-ons Disabled... menu item while Firefox is running.
- Once you get the pop-up, just select "'Start in Safe Mode"
If it works in Safe Mode and in normal mode with all extensions (Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.
Close and restart Firefox after each change via "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: "Firefox > Quit Firefox"; Linux: "Firefox/File > Quit")
You may have to install the Silverlight plugin.
It is possible that some plugins are installed in the plugins folder in the Firefox program folder.
You can set the plugins.load_appdir_plugins pref to true on the about:config page to make Firefox scan the "<install>/plugins/" directory for plugins like the WMP plugin (np-mswmp.dll).
You can alternatively move plugins from "<install directory>/plugins/" to <install directory>/browser/plugins/ to make Firefox find them again.