I have been running https://mailflowmonitoring.com https://mailflowmonitoring.com for the past 6 years on Amber (A Crystal framework) it flawlessly manages the

I have been running https://mailflowmonitoring.com https://mailflowmonitoring.com for the past 6 years on Amber (A Crystal framework) it flawlessly manages the sending and tracking of round trip emails for tens of thousands of pings a day.