Best SMTP Server

AuthSMTP

AuthSMTP is another little known but good outgoing SMTP email service that can be used to send emails from any software, service, device and application can authenticate with a username and password.

JangoMail, Inc.

JangoSMTP is another transactional email delivery service that offers many features. Designed for freelancers, small and midsize business, JangoSMTP provides tracking and authentication to email functionalities

Postmark is an SMTP service that has all the basic features you’ll need to be sure your communications (newsletter, transactional emails) will be delivered as you expect them to be, but in some aspects clearly falls short of its more seasoned competitors.

SendGrid

SendGrid is a leading cloud-based email infrastructure that blends transactional email, email marketing, and SMTP features in a famous API company. It’s not easy to determine which is the SendGrid main area of expertise.

SMTP.com is a SMTP relay and email marketing platform, all in one. If you’re looking for a reliable SMTP server, they provide you with different solutions for your needs, included transactional emails and plans that fit perfectly into your high volumes mailings

SMTP2Go

SMTP2GO is a popular SMTP service which promises to “remove the headaches of email delivery, saving you time and money”, and it keeps promises.

Smtpprovider.com

SMTPProvider is a cloud-based email delivery platform that offers easy-to-use solutions for email deliverability, scalability and reliability needs. Serving large, mid-sized, and even small enterprise clients, the service assures low rate of spam due to reputation as White Hat sender.

SparkPost

SparkPost is one of the new players in the SMTP and transactional email service market. Born in 2014, it became popular quickly and recently took advantage of the user migration from Mandrill.