My client's web application is throwing an error when trying to send an email:
Mailbox unavailable. The server response was 5.7.1 Unable to relay for firstname.lastname@example.org
I don't believe this web server is available outside of my client's network. I believe they access the web site via a network path, something like http://central/MyWebApp/SomeFolder/SomePage.aspx
Emails to local email addresses are able to go through.
1. If the web server application isn't available outside of the company's network, can the web server's smtp service still send to email addresses outside of the company?
2. Assuming that smtp should be able to send out this email, how can this be resolved? I am not a network person and my client's network tech doesn't seem to have the necessary skills. Is this an issue with their SMTP configuration? Do they need to contact their ISP? Do they need someone more knowledgeable?
Thank you for your assistance.