4 Best Flowmailer Free Alternatives in 2026

What is SendGrid?

SendGrid is a complete and modern cloud communication platform that enables marketers to communicate with their customers through transactional and engagement emails. SendGrid has been shipping billions of email campaigns with an uptime, guaranteed. Zero SPAM complaints.

What is SMTP2GO?

SMTP2GO is a software application that installs on your PC and lets you send transactional email messages. It is compatible with any Windows based PC and can be used to send email from almost any application where email can be sent from.

What is Doppler Relay?

Doppler is a transactional email platform that manages the flow of information across the internet. It is a SaaS product that businesses use to connect with audiences on mobile and web channels using email, push notifications, and in-app messaging.

What is Aritic Mail?

Aritic Mail is a customized transactional email software that effectively communicates with customers. It automatically sends timely and personalized messages to your customers, tracks open rates, click through rates and overall customer engagement.