Microsoft Outlook vs Mailjet

Gmail

Online e-mail service from Google

Protonmail

An end-to-end encrypted email service

Zoho Mail

A webmail service with minimalist interface for your organization

Yandex Mail

Free and reliable email for personal and business use from Yandex

Superhuman

A email management tool claimed to be the fastest

SendGrid

Cloud-based email delivery service from Twilio

GetResponse

A platform for email marketing and beyond

Sendinblue

Comprehensive Online Customer Relationship Management Suite

Mailchimp

Email and marketing platform targeted for small Business

Campaign Monitor

Email Marketing