Many Internet service providers and email providers have filtering systems or mail blocking in place to protect you from unsolicited or unwanted email. Unfortunately, these same systems often prevent email that you want to receive from reaching you! Whitelisting our email addresses will ensure that the email you have requested from us will reach you.
Generally, all you need to do is to add the following email addresses to your address book: notifications@basecamp.com (We use a project management software called Basecamp to communicate)
If you are using spam filtering software, you should also enter the above email address into your filtering software whitelist, according to the specific instructions for the software you are using.