Response status codes indicate whether a specific HTTP request has been completed. Here are the types of response codes.
With these response codes, we decide if 1&1 Webmail is down or not.
If our test shows that 1&1 Webmail is up, but you still can't access it, follow these tips.
If our tool shows that 1&1 Webmail is down, then you can not do much to solve it. Just wait for 1&1 Webmail to solve the issue.