In Gmail you have a conversation mode, but just counting the amount of conversations doesn't work since there are often mistakes in there. Also, emails to myself are often in there as well.
Is there a way to see how many people (i.e. different email addresses) I have contacted?
Best Answer
Using third party software
One option is to use a tool such as Email Address Extractor which is a Chrome extension. Using Google's filters, you can generate a list of data and export it to a CSV. You can then manipulate that data in Excel or Google Sheets to get the desired results. For example, you can have a list of every email that was sent, or a list of unique email addresses that you have sent to.
Using Google contacts
By default, whenever an email is sent from the gmail, that address gets added to the All Contacts or Other Contacts list of Google Contacts. You can export a list by doing the following: