smtp error

Hi there @suonoweb,

Thanks for reaching out. That error message is coming from the mail server you’re sending the email to. So in the example, yyy.it is reporting back that there is no such user there. If the account does exist, there is likely a configuration issue on that mail server. Whoever manages that server would need to look into the issue to find out why it’s rejecting emails that are being sent to a valid email address. If I had to guess, it may be a firewall or some other type of security software that’s blocking emails and reporting back that the address doesn’t exist.

I hope that helps! Have a great day!