When sending and receiving from IncrediMail, you may encounter an Error Message. These messages are usually not from IncrediMail; they are from your Email Server, or the Recipient's Email Server, and will give you a clue as to why they message was not sent.
To help you correct these issues, IncrediMail has created a list of common errors, and how to fix them. Simply search for your Error Message from the list below, and click on it for a solution!
Please Note: The Errors are organized alphabetically by Category (3-Digit Errors, Socket Errors, and Textual Errors)
3-Digit Errors beginning with '4'
421 Service not available. The server is shut down.