Compatible XF 2.x versions 2.12.2 License You may not redistribute the addon in whole or in part. Visible branding No Simple addon that will allow you to specify allowed email clients. Users will only be able to use the email clients you specify in the addon options. When a user enters a email client that is not whitelisted, they get an error message. Make a small donation if you love this addon Reactions: Alien, deslocotoco, hostingunlock and 10 others