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Issues setting up an SMTP Email Relay on debian

Hello, I am trying to set up an SMTP mail relay on my Debian server using OpenSMTPD. I was following this SMTP setup tutorial and it seemed to be going smoothly, but I keep running into an issue when I keep sending an email. Here is the co...

Hello,
I am trying to set up an SMTP mail relay on my Debian server using OpenSMTPD. I was following this SMTP setup tutorial and it seemed to be going smoothly, but I keep running into an issue when I keep sending an email.

Here is the command I’m using to send a test email:

echo "Test email body" | mail --subject="Test Subject" --append="From: monitoring@example.com" myemail@example.com

But I get an error message:

mail: cannot send message: Process exited with a non-zero status

I checked the logs using journalctl -f _COMM=smtpd, but I can’t figure out what’s wrong. The logs show:

Invalid recipient: <myemail@example.com>

Does anyone know what could be wrong here?
I changed the email names and such for privacy reasons.

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