Best way to email 3000 contacts from a database?

I've heard of things like Mail Chimp. It is for a client who has launched a new business and they are looking for a free service if one exists.

Many thanks !

submitted by /u/yKoolF
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source https://www.reddit.com/r/Emailmarketing/comments/evkda0/best_way_to_email_3000_contacts_from_a_database/