email,first_name,source,subscribed_date,tags sub1@example.com,Pat,newsletter_signup,2025-08-15,newsletter SUB1@example.com,Pat,facebook_lead_form,2025-09-01,fb_q3_2025 sub1@EXAMPLE.com,Patricia,checkout_optin,2025-10-12,customer sub1@example.com ,Pat W,popup_form,2026-01-08,popup_homepage mike.smith@gmail.com,Mike,import_2024,2024-11-20,legacy mikesmith@gmail.com,Mike S,newsletter_signup,2025-03-15,newsletter m.i.k.e.s.m.i.t.h@gmail.com,Michael,facebook_lead_form,2025-07-22,fb_q3_2025 promos+freebie@gmail.com,Sam,freebie_download,2025-12-01,lead_magnet promos@gmail.com,Sam,newsletter_signup,2026-02-15,newsletter unique1@example.com,Alpha,newsletter_signup,2025-09-10,newsletter unique2@example.com,Beta,popup_form,2025-10-05,popup_homepage unique3@example.com,Gamma,facebook_lead_form,2025-11-12,fb_q4_2025 unique4@example.com,Delta,checkout_optin,2026-01-20,customer jdoe@company-a.com,Jane Doe,newsletter_signup,2025-08-01,newsletter jdoe@company-b.com,Jane Doe,newsletter_signup,2025-08-02,newsletter