Data Retention Policy- Email Sent
While data cleanup process, our team focus is to remove the data whom we have not target in last 2 years. And as per https://nation.marketo.com/t5/Knowledgebase/Marketo-Activities-Data-Retention-Policy-Overview-FAQ/ta-p/250750
data retention policy we came to know that it deletes activity after 25 months for Email send.
Problem- In lead activity, we still see email send details in 2016. We found this when setup the filter "Not was sent email" is any.
How can I justify this activity in Marketo?