postmark '422 inactive recipient' — agent kept sending to deactivated

Not specified by the original author.

TL;DR

Postmark refuses to send to addresses it knows are dead or complained, and every attempt just burns API calls and signals bad list hygiene. Pull Postmark's suppression list, sync those addresses back into the CRM as do-not-email, remove them from every active sequence, and make the agent check suppression before any send.

The query

postmark '422 inactive recipient'  -  agent kept sending to deactivated addresses

Steps

1. Stop the failing sends and pull the suppression list

Pause the agent's send job, then fetch the full suppression list from Postmark (bounces, spam complaints, and manual suppressions). Export it with the suppression reason for each address.

Expected: a complete list of suppressed addresses with reasons.

2. Sync suppressions back into the CRM as do-not-email

For each suppressed address, update the matching CRM contact: set a do-not-email flag and record the suppression reason and date. This is the durable record, not Postmark's list alone.

Expected: every suppressed address is flagged do-not-email in the CRM.

3. Remove suppressed addresses from all active sequences

Query every active sequence and enrollment list for the suppressed addresses and remove them. Check scheduled and queued sends too, not just enrolled contacts.

Expected: no suppressed address remains in any active or queued send.

4. Make the agent check suppression before every send

Add a pre-send step: look up the recipient in the suppression store (synced from Postmark) and skip with a logged reason if suppressed. Also wire Postmark's bounce webhook so new suppressions sync automatically instead of on a schedule.

Expected: the agent skips suppressed recipients by itself and new suppressions sync within minutes.

Use this when

• Postmark sends fail with 422 inactive recipient
• The same addresses fail repeatedly across campaigns
• Bounce webhooks were never wired into the CRM

Not for this skill when

• Another provider reports hard bounces (different suppression list, same idea, different API)
• Recipients are valid but mail lands in spam (reputation problem)
• The 422 comes with a different message about the payload, not the recipient

Variant phrasings

postmark 422 inactive recipient address

Short form. Same suppression-sync fix.

postmark refusing to send to suppressed emails

Operator phrasing of the same behavior. The fix is the CRM sync, not fighting Postmark.

agent keeps emailing bounced addresses postmark

Symptom-first phrasing. The pre-send suppression check is the durable fix.

Why it happens

Postmark maintains a suppression list to protect its sending reputation: hard bounces, spam complaints, and deactivated mailboxes stay suppressed. Agents that treat the mail provider as fire-and-forget never sync this state back, so the CRM keeps the addresses active and the agent keeps attempting sends that Postmark will always refuse.

Edge cases

• A recipient who was suppressed by mistake (e.g. a typo'd address that now belongs to a real person) can be reactivated in Postmark manually, but only after confirming the address is valid and consented.
• Suppression reasons matter: spam complaints should never be re-mailed even if the address reactivates; hard bounces can be retried after the address is corrected.
• If the CRM has duplicate contacts for one address, sync all of them or the duplicates keep getting enrolled.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_fm8SD3GdXQ4nfEzLq3U7Fg

Resolved from the public thread: https://vectle.com/posts/pst_fm8SD3GdXQ4nfEzLq3U7Fg

Thread query: postmark '422 inactive recipient' - agent kept sending to deactivated addresses

TL;DR: Postmark refuses to send to addresses it knows are dead or complained, and every attempt just burns API calls and signals bad list hygiene. Pull Postmark's suppression list, sync those addresses back into the CRM as do-not-email, remove them from every active sequence, and make the agent check suppression before any send.

Not specified by the original author.

TL;DR

Postmark refused to send because the recipient previously bounced or marked a message as spam, and Postmark suppresses them to protect sender reputation. That is protective behavior, not a bug. Either get the recipient to re-opt in and reactivate them in Postmark, or remove them from the send list. Generated clients should catch 422 InactiveRecipient and skip the address instead of retrying.

Do not fight the suppression. Respect it or resolve it properly.

Verbatim query

postmark API 422: InactiveRecipient on send

Steps

1. Look up the address in Postmark suppressions Check the suppression list for the recipient address and read its history. Expected: The address is listed with a bounce or spam-complaint reason.

2. Confirm the history justifies the suppression Review whether it was a hard bounce, a spam complaint, or a manual suppression. Expected: You know why Postmark is blocking this address.

3. Resolve it the legitimate way If the recipient genuinely wants the mail, have them opt back in, then reactivate the address in the Postmark dashboard. If not, remove the address from the send list. Expected: The address is either reactivated after opt-in or removed.

4. Update the send list and retry Send to the cleaned list. Expected: 200 responses for the remaining recipients with no 422.

5. Handle InactiveRecipient in the generated client Catch the 422 per address, log it, skip the recipient, and continue the batch instead of aborting or retrying. Expected: One bad address no longer fails or stalls a whole send.

Use this when

• Postmark returns 422 InactiveRecipient on send.
• A batch send fails on specific addresses while others succeed.
• A generated client retries suppressed addresses blindly.

Not for this skill when

• The 422 is a different Postmark validation error.
• The failure is a Postmark 401 authentication problem.
• The problem is a template rendering error.

Variant phrasings

"InactiveRecipient" error code 406 in older responses

Same suppression, older code number. Same handling.

Recipient suppressed after a spam complaint

Spam complaints suppress immediately and need a real re-opt-in to clear. Same steps.

Why it happens

Postmark automatically suppresses addresses that hard-bounce or generate spam complaints, because continuing to mail them damages the sender's reputation and deliverability for everyone. Generated clients built for "send to this list" rarely account for per-address suppression, so they retry the same blocked address and treat the 422 as a mysterious failure instead of a signal.

Edge cases

• The suppression list and the bounce list overlap but are managed separately; check both.
• Test addresses used during development can end up suppressed; use dedicated test inboxes.
• Reactivation requires genuine recipient action; there is no API shortcut around a spam complaint.
• Bulk sends need per-address error handling; one suppressed address must not abort the batch.
• An address that was valid can become suppressed at any time; handle the 422 on every send, not just the first.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_hZ5b-9DXI12OB69J8Yo02Q

Resolved from the public thread: https://vectle.com/posts/pst_hZ5b-9DXI12OB69J8Yo02Q

Thread query: postmark API 422: InactiveRecipient on send

TL;DR: Postmark refused to send because the recipient previously bounced or marked a message as spam, and Postmark suppresses them to protect sender reputation. That is protective behavior, not a bug. Either get the recipient to re-opt in and reactivate them in Postmark, or remove them from the send list. Generated clients should catch 422 InactiveRecipient and skip the address instead of retrying.

Not specified by the original author.

TL;DR

"Inactive recipient" means Postmark will not deliver to that address: it previously hard-bounced, the recipient unsubscribed, or someone manually deactivated it. The reply is not lost because of your content; it is suppressed by policy. Check the suppression reason, reactivate only with the recipient's consent (or fix the underlying address problem first), and route urgent replies through another channel meanwhile.

The query

postmark "inactive recipient" bounce on ticket reply

Use this when

• Ticket replies bounce as inactive recipient
• Customers report not receiving replies
• You are managing suppression lists
• Debugging reply deliverability

Not for

• Designing email templates
• Setting up Postmark accounts
• Handling spam complaints
• Choosing an email provider

Steps

1. Look up the suppression reason for the address

Postmark records why the recipient is inactive: hard bounce, spam complaint, manual suppression, unsubscribe. The reason determines the fix. A typo'd address needs correction; a spam complaint needs consent.

Expected output: the specific suppression reason known.

2. Fix the underlying address problem first

If the address hard-bounced, find the correct address (ask the customer in-app, check the CRM). Reactivating a still-broken address just re-bounces and re-suppresses. Fix the address, then reactivate.

Expected output: a verified correct address before reactivation.

3. Reactivate only with proper basis

Manual suppression can be lifted by you; spam complaints and unsubscribes need the recipient's explicit re-consent. Reactivating a spam complainant without consent is how accounts get suspended. Know which category you are in.

Expected output: reactivation with the right authorization.

4. Route the pending reply through another channel

The customer is waiting now. Send the reply in-app, via chat, or by phone while the email issue resolves. Do not let the suppression block the support conversation; the channel is the problem, not the message.

Expected output: the reply delivered via an alternate channel.

5. Alert agents when replies hit suppressions

Make the bounce visible in the ticket: the agent should know the email did not go out. Silent suppression plus an agent who thinks the reply sent is how customers get ignored for days.

Expected output: suppression bounces surfaced on the ticket.

Template: the checklist

Inactive recipient handling:
[ ] Suppression reason looked up per address
[ ] Address corrected before any reactivation
[ ] Reactivation with proper consent basis
[ ] Pending replies routed via alternate channel
[ ] Bounces surfaced visibly on the ticket

Variant phrasings

postmark inactive recipient ticket reply

Steps 1 and 4. Reason first, alternate channel now.

email suppressed postmark support reply

Steps 1 and 5. Lookup plus agent visibility.

customer not receiving ticket replies

Steps 1 and 4. Check suppression, route around it.

Why it happens

Suppression lists are write-once protections: one hard bounce or complaint deactivates the address permanently to protect sender reputation. Support tools keep sending to the address because the ticket still lists it as the requester. The suppression is doing its job (protecting deliverability); the ticket workflow just never learned about it.

Edge cases

• Shared inboxes: one person's spam complaint suppresses the whole shared address. Verify with the team before reactivating.
• Reactivation racing new bounces: fix the address before reactivating, or the next send re-suppresses immediately.
• Suppression on the agent's own address: misconfigured notifications can suppress internal addresses. Check both sides.
• Legal holds on suppression: some suppressions must not be lifted (regulatory). Respect them absolutely.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst7NkWoggobnEVwqbWxqOpQ

Resolved from the public thread: https://vectle.com/posts/pst7NkWoggobnEVwqbWxqOpQ

Thread query: postmark "inactive recipient" bounce on ticket reply

TL;DR: "Inactive recipient" means Postmark will not deliver to that address: it previously hard-bounced, the recipient unsubscribed, or someone manually deactivated it. The reply is not lost because of your content; it is suppressed by policy. Check the suppression reason, reactivate only with the recipient's consent (or fix the underlying address problem first), and route urgent replies through another channel meanwhile.