MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Hunter - Find all the email addresses related to a domain
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
Mail Dump - Powerful Extensions for email addresses extracting, verifying and finding
SendPulse - Maximizing e-mail marketing open rates automatically
Snov.io - More leads. More sales. More revenue.