Personalisation and segmentation: increase relevance without overreaching

Useful personalisation reflects a genuine relationship or preference. Incorrect names, inferred sensitive details and excessive data use reduce trust instead.

Segmentation can be more valuable than inserting a first name. Sending the right message to a smaller relevant group improves recipient experience and reduces unnecessary volume.

Use personal data carefully

  • Define why each data field is needed.
  • Keep values current and provide a neutral fallback.
  • Do not expose private account data in subject lines or previews.
  • Avoid sensitive inferences that may surprise the recipient.
  • Test escaping so names and fields cannot break HTML or headers.
  • Explain and honour preference choices.

Legal and privacy requirements depend on the data and jurisdiction. Personalisation should be designed with the organisation's privacy notices, lawful basis, retention and security controls—not added as an isolated marketing feature.

Key takeaway
Personalise only with accurate data the recipient would reasonably expect you to use.
Practical next step

Test templates with missing, unusually long and special-character names, then review whether every merged field is necessary and expected.

Using AuthSMTP

AuthSMTP transports the final message; your application is responsible for selecting the recipient, merging data safely and ensuring each generated message contains only the intended recipient's information.