Build optimized content

When building your emails, keep the general best practices below in mind.

  • Keep design simple

  • Keep mobile users in mind

  • Avoid entirely image-based emails

  • Use email-safe fonts

  • Encode special characters

Subject line

Work on the subject line to improve open rates:

  • Avoid subjects that are too long. Use 50 characters maximum

  • Avoid using repetitively words like “free” or “offer”, that could be considered as spam

  • Avoid capital letters, and special characters like “!”, “£”, “€”, “$”

Mirror page

Always include a mirror page link. Preferred position is a the top of the email. Learn more

The unsubscription link is essential. It must be visible and valid, and the form must be functional. Learn unsubscription link guidelines in this section.

By default, when the message is analyzed, a control typology rule checks whether an opt-out link has been included and generates a warning if it is missing.

Tip: Because human error is always possible, check that the opt-out link works correctly before each time you send. For example, when sending the proof, make sure the link is valid, that the form is on-line and that the No longer contact this recipient field is changed to Yes.

Learn how to insert an opt-out link in this section.