MailSpyMailSpy 
The latest version of MailSpy is 1.0 on Mac Informer. It is a perfect match for E-mail in the Communication category.
MailSpy is a powerful tool that allows you to trace the geographic location from which your emails were sent. By analyzing the sender’s location and any intermediate 'stops' your email may have made, MailSpy gives you insight into the route and origin of your messages. Whether you’re curious about where an email came from or want to gather more information about the sender, MailSpy has you covered.
In addition to showing the location of the sender, MailSpy provides valuable details such as the email client used and other metadata to give you a full picture of your email’s journey. This application is perfect for anyone looking to gain deeper insights into their incoming emails with just a few taps.
SDR-RADIO.com
WhiteList
Softwarenetz Rechnung3
Mira
OBS Studio
ACDSee
ProModeler