503 5.5 0 need mail before rcpt
A classic SMTP error message!
The message "503 5.5 0 need mail before rcpt" is an SMTP error response code, which means that the mail server is refusing to accept the email message because it's missing a required parameter.
Here's a breakdown of the code:
503: This is the SMTP error code, which indicates that the server is refusing to perform the requested action.5.5: This is the specific error code, which indicates that the server is refusing the message because it's missing a required parameter.0: This is the error code extension, which provides additional information about the error.need mail before rcpt: This is the human-readable error message, which explains that the server is refusing the message because it's missing theMAILcommand before theRCPTcommand.
In other words, the mail server is saying that it needs to see the MAIL FROM command (which specifies the sender's email address) before it can accept the RCPT TO command (which specifies the recipient's email address).
To fix this error, you'll need to make sure that your email client or script is sending the MAIL command before the RCPT command. This is usually done by specifying the sender's email address in the MAIL FROM command, like this:
MAIL FROM:<[email protected]>
RCPT TO:<[email protected]>If you're using a programming language or a specific email client, you may need to check the documentation or configuration settings to ensure that the MAIL command is being sent correctly.