You can easily extract IDs Mac MSG files using MacUncle MSG Email Address Extractor. The tool supports Mac OS Machines.
Start MacUncle MSG Email Address Extractor on your Mac Computer
Select one option from Add File(s) or Add Folder(s) to upload MSG file.
Choose requires MSG email files to extract Email ID
Go to Extract on the Above Menu and select Saving Option. Set up the required field on the filter option for selective extraction
Click the OK button to start Email Address Extraction from the MSG file.
In a few moments, the tool opens the location with a resultant CSV file consisting of an MSG email address.