Planning Center records every email sent and received through the system for three months. You can check your email history to make sure that everything was delivered.
If someone mentions they didn't receive an email, try these things:
If neither of these help, contact support by clicking the ? in the top right corner of the app.
You can see a list of all the emails a person has received through Planning Center from the Communication tab on their profile page.

To view your sent and received email history, click the Communication tab in your profile.
Notice
Email history is kept for three months.

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Choose to view Received or Sent messages.
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Click a message to view its contents.
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Click to load the next 10 messages.
Only users with Scheduler permissions or higher can send new emails from Services.