![]() ![]() But there are other possible reasons and other possible error messages. 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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May 2023
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