SMTP error 530 typically occurs when there is an issue with the client's authentication with the sender's email server or in exceptional cases where the sender's IP address is within a public or private blocklist.
Resolving this issue involves ensuring that the user credentials used to authenticate with the email server are valid and that there are no syntax errors within the username and password fields.
If the user credentials are valid, the next step is to verify if the client's IP address is within a blocklist. If the IP address is within a blocklist, users may follow the appeal process to exclude the specific IP address from the blocklist(s).
View all errors