NDRs (Non-Delivery Reports) 9/10/2008 8:17:00 AM NDR spam: Why am I receiving an NDR for a message I didn’t send? NDRs are a normal part of email exchanges, but spammers' activities can cause spikes in NDR activity. Spammers send junk messages to thousands of email addresses, some of which exist and some of which do not. To give the appearance that their messages are legitimate, spammers use a practice called "spoofing," whe   more...

Actual vs. Typical SMTP Response Times (Hourly)	Relative Response Today
Average SMTP Response times over the last 7 days