Introduction

This guide shows LimeSurvey users how to keep their invitations from being flagged as spam.

Key Strategies

Domain Alignment

Ensure that the links in the email lead to a survey hosted on the same domain as your sender address — for example, if you send from mail@yourdomain.net, the survey link should point to survey.yourdomain.net. This consistency signals legitimacy to spam filters.

SMTP Configuration

Using your own domain's SMTP server rather than generic email services provides better control. Implementing SPF, DKIM, and DMARC authentication protocols establishes credibility with email providers.

Branding Options

If your plan includes alias domains, use one to achieve the domain alignment described above.

Content Guidelines

• Avoid excessive promotional language
• Use clear, descriptive subject lines
• Include straightforward unsubscribe mechanisms

Recipient Consent

Ensure that you have explicit consent from recipients before sending them survey invitations, since unsolicited messages face higher spam classification risk.

Pre-Delivery Testing

Tools like Mail Tester allow senders to identify potential spam filtering issues before mass distribution.