Why are my Lob postcards not being created?
The Lob help pages give 4 common reasons. The first to rule out: Depending on how strict your account's address setting is, Lob can refuse postcards to addresses the post office cannot deliver.
Is it broken, or just quiet?
A number can fall because fewer people came, or because something stopped counting them. Below are the causes the Lob help pages give, and how to check each one yourself.
What causes it?
Depending on how strict your account's address setting is, Lob can refuse postcards to addresses the post office cannot deliver.
In the Lob help:
Mail piece requests sent with non-deliverable addresses will return a `422` (Unprocessable Entity) error.
Managing mail settings, read 2026-11-12.If the account has no confirmed way to pay, Lob does not accept live postcards.
In the Lob help:
You must have a verified bank account or credit card to submit live requests.
Error reference, read 2026-11-12.If the artwork file is the wrong size for a postcard, Lob does not make the postcard.
In the Lob help:
File dimensions are incorrect for the selected mail type.
Error reference, read 2026-11-12.Sending too many requests too fast can get some of them turned away.
In the Lob help:
Requests were sent too quickly and must be slowed down.
Error reference, read 2026-11-12.
How do I check it myself?
Look for error replies from Lob on the requests that should have made postcards. A request that got an error made no postcard.
In the Lob help:
Live requests that result in a non-2XX code response are indicative of resource creation being stopped.
Error reference, read 2026-11-12.Check how strict your account's address setting is. A stricter setting turns away more postcards, while the most relaxed one makes every postcard whatever the address.
In the Lob help:
All mail pieces will be successfully created and mail delivery will be attempted, regardless of address validity.
Managing mail settings, read 2026-11-12.
How would I know the day it starts?
- Feder reads your postcards sent from Lob each day and compares each day with your own history.
- It does not read the errors Lob returns. It tells you when postcards sent go quiet or move outside their usual range.
Some numbers are too quiet to judge daily, such as a form filled in a few times a week. Until there is enough of your own history to judge a change, Feder says it is still learning and scores nothing, rather than guessing.
See what Feder reads from Lob, which feeds Reach. Feder only reads. It never changes anything in Lob.
What else goes wrong with these numbers?
- Why did Lob mail the same postcard twice?Lob
- Why haven't my Lob postcards been sent yet?Lob
- Why did Google Analytics stop collecting data?Google Analytics
- Why aren't my key events showing in Google Analytics?Google Analytics
- Why does Google Analytics show (not set)?Google Analytics
See every question.
Where do these answers come from?
Every cause and check on this page comes from the Lob help pages, quoted above with the date we read them. Last reviewed 2026-11-12. We read them again by 2027-11-12. If one changes, this page changes or comes down.