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![Andris Reinman](https://ph-avatars.imgix.net/511370/original.jpeg?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
Andris Reinman
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Over the years, I've been approached by numerous SaaS service and startup builders seeking guidance on integrating email-sending capabilities into their platforms. Recognizing the recurring challenges and the consistent solutions, I felt compelled to create this guide.
![Email Sending Guide for SaaS builders](https://ph-files.imgix.net/8b0bb3bc-12e3-4b26-8907-cdc0e6431858.png?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
Email Sending Guide for SaaS builders
Technical email guide for sending emails from SaaS services
![Andris Reinman](https://ph-avatars.imgix.net/511370/original.jpeg?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
The free "Email Sending Guide for SaaS Builders" is a detailed resource for SaaS developers. It categorizes emails into three types: Transactional, Marketing, and Sending on Behalf of the User.
![Email Sending Guide for SaaS builders](https://ph-files.imgix.net/8b0bb3bc-12e3-4b26-8907-cdc0e6431858.png?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
Email Sending Guide for SaaS builders
Technical email guide for sending emails from SaaS services
![Andris Reinman](https://ph-avatars.imgix.net/511370/original.jpeg?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
EmailEngine is a self-hosted application that opens IMAP and SMTP connections against registered email accounts to translate API requests to IMAP commands, send emails, and monitor changes on these accounts. It sends a webhook for every update on the account.
![EmailEngine](https://ph-files.imgix.net/83172c9c-ead5-44cc-9608-8b2ee42b5ea3.png?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
EmailEngine
Access any email account to receive/send emails with an API
![Andris Reinman](https://ph-avatars.imgix.net/511370/original.jpeg?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
Andris Reinman
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When I wanted to build a Cordova-based email app I realized that handling email protocol stuff inside the app makes things too difficult. So I built EmailEngine, a self-hosted API server to translate REST to IMAP/SMTP.
![EmailEngine](https://ph-files.imgix.net/83172c9c-ead5-44cc-9608-8b2ee42b5ea3.png?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
EmailEngine
Access any email account to receive/send emails with an API
![Andris Reinman](https://ph-avatars.imgix.net/511370/original.jpeg?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
Outfunnel's App connector makes it incredibly easy to create deep data connections between all your marketing tools and CRM (Copper, Pipedrive, HubSpot). Not very exciting, but extremely useful if you’d like your sales and marketing people to work together.
App Connector by Outfunnel
Connect your sales and marketing data, deeply and easily
![Andris Reinman](https://ph-avatars.imgix.net/511370/original.jpeg?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
Outfunnel is a marketing automation tool that helps you drive revenue. Make your sales and marketing work together through automated email campaigns, web tracking insights and ridiculously deep CRM integrations.
Outfunnel
Marketing automation that drives revenue
![Andris Reinman](https://ph-avatars.imgix.net/511370/original.jpeg?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
IMAP API is a self hosted application for accessing IMAP accounts over REST API. IMAP API daemon connects to user's IMAP account, translates API requests to IMAP and also sends webhooks for changes like new or deleted emails.
![IMAP API](https://ph-files.imgix.net/5774c831-9973-4e27-99fc-4d33d2d94d38.png?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
IMAP API
Self hosted and lightweight daemon application
![Andris Reinman](https://ph-avatars.imgix.net/511370/original.jpeg?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
![Wild Duck IMAP server](https://ph-files.imgix.net/55b48fd2-e60d-4d06-9834-e41e86e2cfae.jpeg?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
Wild Duck IMAP server
Distributed open source IMAP server built on Node.js+MongoDB
![Andris Reinman](https://ph-avatars.imgix.net/511370/original.jpeg?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
![ZoneMTA](https://ph-files.imgix.net/f819883a-5e67-4ddf-9747-df80b8bdf985.png?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
ZoneMTA
Modern and feature packed outbound SMTP server
![Andris Reinman](https://ph-avatars.imgix.net/511370/original.jpeg?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
![Mailtrain](https://ph-files.imgix.net/04135e82-312d-4e77-b909-bb93eaacde01.png?auto=compress&codec=mozjpeg&cs=strip&auto=format&w=48&h=48&fit=crop&frame=1)
Mailtrain
Self hosted newsletter app (Mailchimp clone)