All of our mail relaying for notifications are done internally. Our web host is wanting to relay mail for job application submissions to our HR Department. They are using http://demotesturl.com/smtp/
to test the SMTP settings I provide them, but fails? I have created a mail relay user in exchange with a password but still no luck. I can send an email from an external email client via telnet tho?
Normally from withing the Exchange 2013 Admin Center I will just add the internal IP addresses to a receive connector I have configured to allow internal servers to relay mail for alerts. Would this be the same for an outside vendor/service?
Is there anywhere I can see logs as to why this is failing or where to double check the configurations?