Dead letters

Operator page

Replaying is safe to repeat, but work out why something failed before you replay it in bulk.

FMS never talks to Stripe or Mailchimp directly in the moment. It writes the message down first, then a worker delivers it, retrying with growing gaps. A message that keeps failing ends up here.

The dead letters screen — What died, when, how many attempts, and the last error.

The Health and Dead letters tabs — Dead letters is the second tab under Health.

Reading one

A dead letter with its payload open — Payload shows exactly what FMS was trying to send.

The last error usually says it plainly: a key was rejected, an address was invalid, a service was down.

Replaying

Replay on a row puts one message back in the queue. Replay all does the lot. Replaying is safe to repeat: the receiving system will not act on the same message twice.

Replay once the cause is fixed. Replaying into a still-broken connection just refills the list.

When to escalate

The list is growing while you watch
The same error repeats across many different members
Anything mentioning a key being rejected

Tell Thomas the error text and roughly how many rows share it.

Dead letters ​

Reading one ​

Replaying ​

When to escalate ​

Dead letters

Reading one

Replaying

When to escalate