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Mail server configuration


Restyaboard is an open source alternative to Trello, but with smart additional features like offline sync, diff /revisions, nested comments, multiple view layouts, chat, and more. And since it is self-hosted, data, privacy, and IP security can be guaranteed.

Restyaboard is more like an electronic sticky note for organizing tasks and todos. Apart from this, it is ideal for Kanban, Agile, Gemba board and business process/workflow management. It can be extended with productive plugins

Today, several universities, automobile companies, government organizations, etc from across Europe take advantage of Restyaboard.

This document contains information about how to troubleshoot problems receiving email, how to configure external SMTP server, how to troubleshoot emails received in spam folder issue, how to troubleshoot email issues in Azure hosting

What you'll learn

  • How to troubleshoot problems receiving email
  • How to configure external SMTP server
  • How to troubleshoot emails received in spam folder issue
  • How to troubleshoot email issues in Azure hosting


In Restyaboard, emails are sent using PHP’s inbuilt mail() function which inturn relies on system’s mail server, usually, sendmail program on Linux.

Receiving emails in Linux based setup

  • Restyaboard’s install script installs Postfix MTA (Mail Transfer Agent) which is a modern replacement for sendmail and has compatible interface. So, usually you should receive emails on Linux based setup without any issues. But, emails may be delivered to spam folder and or you may want to make use of external SMTP server. Those concerns are addressed in other sections below.

Receiving emails in Windows based setup

  • In Windows machine, you’ll need additional program that mimics sendmail functions. If you setup Apache/nginx/PHP using multiple installer programs such as WPN-XM, they usually comes with such feature.

  • Alternatively, you may also use external SMTP server as mentioned in php.ini based approach to setup external SMTP (for Windows)

Multi installers to setup PHP on Windows that come with sendmail feature

Configuring external SMTP server

Sometimes you may want to make use of external SMTP server to send mails. One popular approach in PHP ecosystem is to use mailer scripts such as PHPMailer and Swift Mailer to hook to external SMTP server. As Restyaboard’s original goal was to keep the codebase lighter and faster without any bloat, it didn’t include any of such script based solutions.

Postfix based approach to setup external SMTP (for Linux)

php.ini based approach to setup external SMTP (for Windows)

Troubleshooting emails received in spam folder issue

When emails are being sent from local machine and or intranet setup, most mail solutions such as Gmail may flag them as spam and will send them to spam folder. Unfortunately there is no good solution to handle this situation. You may however ask all users of such Restyaboard instance to set up filters in Gmail so that mails are sent to inbox instead of spam.

If you use external server hosting and still receive emails in spam folder, you may follow Google’s suggested best practices

Solving spam issues using SPF, DKIM and DMARC

Guides to assist in setting up SPF, DKIM and DMARC

Testing SPF, DKIM and DMARC setup

You may use below online free tool to test your report

If there are no problems reported, most likely the emails will be received in inbox.


  • Please note that for some cases, setting up SPF, DKIM and DMARC may not still work as mail systems use lot of heuristics to determine spam and can flag system mails as spam.

Troubleshooting email issues in Azure hosting

By default, Azure hosting blocks all outgoing mails. So, even if you use Linux VM on Azure, emails won’t be sent.

Possible solutions for Azure hosting

  • Contact Azure support

  • Use external SMTP server