What is mailbaggercom?

Answer 1

Well, it is an invalid website as I can tell you now.

TechRepublic Reports: Some emails that a vendor or ours sends are getting bounced back to them. The interesting part is, when I check our logs to see why it was bounced, there is no record of the email every making it as far as our email filter. We use AT&T's email filtering servcie, which we can log into and see all emails that have passed through their filter. I have confirmed that all of our SMTP traffic routes through the email filter before it hits our server. Are there any other steps I can take to try to figure this out?
My feeling is the issue is on the vendor's end. They were able to send me one of their NDRs and from what I can tell they are using a Unix or Linux based system to attempt to send these emails. If I am reading the NDR correctly the DNS service they are sending it to is one I've never heard of and haven't been able to find much information on them.

I guess that is some kind of spamming website. You better say away from this.