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The basic reason for SMTP error RCPT TO 550 5.1.1 is a typo in the recipient’s email address, such as a missed or duplicated character, resulting in an invalid address. So, does this mean that 550 5.1.1 error code can be caused by issues with both the recipient and sending server? Let’s find out. In this case, it is identifying an issue with a sending server that has used SMTP protocol instead of ESMTP. You may see this error message if the outgoing email was rejected. 550 5.5.1 error messages you can encounter 550 5.1.1 : User unknown 550 5.1.1 : Recipient rejected 550 5.1.1 : Recipient address rejected 550 5.1.1 : Recipient address rejected: User unknown in virtual alias table 550 5.1.1 : Recipient address rejected: User unknown in relay recipient table 550 5.1.1 : The email account that you tried to reach does not exist 550 5.1.1 : Mailbox not found 550 5.1.1 : Invalid mailbox 550 5.1.1 : Mailbox unavailable 550 5.1.1 : Unrouteable address 550 5.1.1 : Mailbox temporarily disabled 550 5.1.1 : No such user here

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.