Notification Errors

[Alex Bernal]

Hi all, I just inherited a Mac environment (I've only done Windows for the last 25 years) that makes use of Munki and Autopkgr. I noticed that we used to get an email every morning regarding the scheduled AutoPkgr runs. This email advised if any new packages were downloaded, errors ocurred, etc. A few days ago these emails stopped coming.

I opened AutoPkgr and went to the Notifications Tab and clicked "Send test Email" and get the following error: 

So that explains why the email notification is no longer sent... but I have no idea how to fix it. I've googled for hours and found absolutely nothing regarding the error and as I said, I'm so new to Mac I don't know how to use/troubleshoot the Keychain either. 

Any help would be appreciated, thanks.

Alex