Whenever we detects something wrong with your site it can send you a notification. We have multiple channels available: Slack, Telegram, webhooks, and many more. The most popular channel our users use is just a simple mail. Behind the scenes, Oh Dear uses Postmark to send out mails. Postmark will inform us whenever a notification mail results in a hard bounce. A hard bounce means that the mail won't be delivered. The most common reason for this is that the mailbox doesn't exist (anymore).

Since Oh Dear was launched, we offered a traditional login using the familiar email and password combination. Today, we've launched our social login. This feature allows you to use your Google or GitHub account to log into Oh Dear. You'll see these two new buttons on the registration and login page. When clicking one, we'll use your Google or GitHub account to log in. When logging in, we'll search for an Oh Dear account whose email matches the email used for your Google / GitHub account.

When we make a request to your site to verify that your site is up, the response of your server will contain certain headers. We can verify that those headers contain the values you expect. If these expectations are not met, we'll consider your site as down. In the "Responses" section of the uptime settings page, you can specify which headers we should verify. You could add this expectation to ensure your page uses gzip compression.