Customers may not receive a campaign if:Documentation Index
Fetch the complete documentation index at: https://help.maestra.io/llms.txt
Use this file to discover all available pages before exploring further.
- Failed to send from Maestra (e.g., no subscription, expired consent, customer in Control Groups list, etc.);
- Failed to deliver to the recipient’s email server.


- Find all undeliveries with the reason Mailbox full.
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- Find all send failures where the message could not be composed.

- Find customers who had two or more undeliveries with the reason Recipient rejected email due to content for the last week.
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