There was a time when companies wanting to effectively make use of email as a marketing channel had to buy bulk email software to send emails to their customers and mailing list subscribers.
But times have changed. Cloud-based email delivery platforms like Sendgrid, Mandrill, Mailgun and Amazon SES have rapidly grown in popularity, calling into question the need for bulk email software.
https://www.clickz.com/do-brands-still-need-bulk-email-software/113213/