![]() ![]() In most cases, this is because the recipient address does not exist. The most frequent error message is “ User unknown”. It is an error code that usually stands for some issue with the recipient server. The client typically receives a 550 5.1.1 code as a reply to RCPT TO command. Today we’ll discuss one of them, 550 5.1.1 error, and explain how to fix it. Error codes can have different meanings on different servers, so you have several potential options for resolving the issue. We discussed this communication in our blog post on SMTP Commands and Response Codes. ![]() The client uses text commands and the server replies in numerical codes attached with messages. An SMTP session consists of back-and-forth communication between the client and the server. ![]()
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