Why is it important to prevent duplicate trigger events?

Duplicate trigger events create serious problems:

Recipient impact:

Receiving the same email multiple times is annoying. It signals incompetence or system problems. Erodes trust in your brand.

Engagement damage:

Duplicates inflate send volume while degrading engagement rates. Recipients may unsubscribe or complain to stop the duplicates.

Reputation harm:

High volume to same recipients in short windows looks like spam behavior. Complaints from frustrated recipients damage sender reputation.

Resource waste:

Unnecessary sends consume sending capacity and cost money. Support resources get consumed handling complaints about duplicates.

Causes of duplicates:

API retries after timeout (event successful but confirmation failed). Data sync loops between systems. Webhook delivery retries. User actions triggering multiple events.

Duplicates are never acceptable to recipients. Technical explanations do not excuse poor experience.