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You'll never be 100% sure they received the email.
You can filter by Email is Delivered to see whose server provided Marketo with a clear response. Then you can look at Opens and Clicks to find people who almost certainly received it and did something about it.
Clicked Link in Email
Opened Email
BUT, going beyond that - to make sure that the Confirmation Email went out, please check the Confirmation flow in your Program>Results and look for that person's name. That will tell you if it went out.
It is possible the email disappeared into the Spam filter as well.
What I usually do is have a series of Progression Campaigns listening for other statuses:
Send - this gets done after the email is sent
01 - Delivered - confirms delivery
02 - Opens
03 - Clicked
04 et.c....
You'll never be 100% sure they received the email.
You can filter by Email is Delivered to see whose server provided Marketo with a clear response. Then you can look at Opens and Clicks to find people who almost certainly received it and did something about it.
Clicked Link in Email
Opened Email
BUT, going beyond that - to make sure that the Confirmation Email went out, please check the Confirmation flow in your Program>Results and look for that person's name. That will tell you if it went out.
It is possible the email disappeared into the Spam filter as well.
What I usually do is have a series of Progression Campaigns listening for other statuses:
Send - this gets done after the email is sent
01 - Delivered - confirms delivery
02 - Opens
03 - Clicked
04 et.c....