Bring your list across from whatever you use now. Drop maps the columns, catches duplicates, records how each person consented, and refuses to email anyone who asked you to stop.
Real exports have awkward column names, inconsistent capitalisation and duplicates. Drop expects that.
SCREENSHOT — column mapping, with columns detected automatically
GDPR asks you to know why you hold someone’s address. Drop asks once, at import, and stores the answer — so it survives the person who imported them.
SCREENSHOT — the consent question at import
In most tools an unsubscribe is a flag some code has to remember to check. In Drop the database refuses the write.
DIAGRAM — an import attempting to re-add an unsubscribed address and being rejected
The rest of Drop
The hardest email to send is the one after the last one you never sent.