# X_MAIL_EVENT_PROVIDER_UNREACHABLE

## Means

an SNS endpoint the receiver needed did not answer

## Typical cause

the signing-certificate download or the subscription-confirm GET failed

## Fix

`curl -sS -m 5 -o /dev/null https://sns.us-east-1.amazonaws.com/` — from the app host, with its region

[Mail](/error-codes#mail)