SMTP.com vs. Knock

SMTP’s relay service infrastructure can solve your delivery issues — quickly. We maximize the number of emails that reach recipients’ inboxes by using our own IP addresses and monitoring your emails for anti-SPAM compliance. By improving your deliverability you’ll see improved ROI. Engagement rates will increase and you can use your resources more efficiently - to get the highest return on every marketing dollar you spend.

Knock is infrastructure for sending product and customer messaging. Ship cross-channel product notifications and lifecycle messaging that drives engagement, growth, and retention. Knock has everything you need to power notifications for your product, including: - A powerful workflow engine to automate and manage your entire cross-channel motion, from in-product messaging to email and push notifications. - Branded, in-product messaging components, including embeddable inboxes, feeds, and lifecycle messages. - Broadcasts make it easy to send effective, one-time messages to custom audiences.