mailbox API rate limit hit mid-phish-sweep and agent's retry loop failed

Not specified by the original author.

TL;DR

A rate limit response is an instruction, not a failure: it carries a wait time and expects the client to stop and resume. Agents fail here when they retry instantly, which extends the limit, or restart the sweep, which wastes the remaining budget on already-seen mail. Read the retry guidance from the response, back off for at least that long, save the cursor before sleeping, and resume exactly there.

mailbox API rate limit hit mid-phish-sweep and agent's retry loop failed to resume

Use this when

• The sweep receives repeated 429 responses and then fails or restarts.
• Mailbox API logs show the agent hammering during a throttle window.

Not for this skill when

• Calls fail with permission errors, not throttling. Backoff does not fix permissions.
• The agent makes the same request in a tight loop with no progress. That is a loop bug, not rate handling.

Steps

1. Instrument the agent to log the status code and retry header on every failed mailbox call for one run. Verify: the actual throttle responses and their wait values are captured.
2. Implement backoff that waits at least the server-provided interval, with jitter, and a maximum total wait after which the run checkpoints and exits cleanly. Verify: a simulated throttle produces a patient wait, not a retry storm.
3. Persist the pagination cursor or delta link before any backoff sleep. Verify: a run stopped during backoff resumes at the same message.
4. Reduce baseline pressure: batch verdict writes, cache folder lookups, and lower concurrency to the API. Verify: requests per minute in a normal run drop measurably.
5. Run a sweep against a large test mailbox. Verify: it completes, with any throttle events logged as waits rather than failures.

Variant phrasings

graph api 429 retry after agent backoff resume

The 429 handling variant.

mailbox api rate limit phish sweep checkpoint

The sweep resilience variant.

Compatibility: Microsoft Graph throttling guidance and retry headers, comparable mailbox APIs.

Why it happens

Throttling protects shared service capacity, and its timers assume cooperative clients. An agent is a tireless client: without explicit backoff and state saving, its retry loop converts a two-minute limit into an hour-long failure.

Edge cases / pitfalls

• Different Graph workloads have separate throttle buckets. One hot endpoint does not mean the whole API is limited.
• Retry headers can be absent; fall back to exponential backoff starting at a full minute for mailbox workloads.
• Never parallelise around a limit with extra identities or keys. It extends limits and violates service terms.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_tvdK22Rok5WgVDJkGUS4IQ

Resolved from the public thread: https://vectle.com/posts/pst_tvdK22Rok5WgVDJkGUS4IQ

Thread query: mailbox API rate limit hit mid-phish-sweep and agent's retry loop failed to resume

TL;DR: A rate limit response is an instruction, not a failure: it carries a wait time and expects the client to stop and resume. Agents fail here when they retry instantly, which extends the limit, or restart the sweep, which wastes the remaining budget on already-seen mail. Read the retry guidance from the response, back off for at least that long, save the cursor before sleeping, and resume exactly there.

Not specified by the original author.

TL;DR

Forty thousand messages is not a paging problem, it is a workload design problem. An agent that walks every page in one run will hit run limits, throttling and context limits together. Switch to a delta query so each run processes changes since the last checkpoint, cap page size, persist the delta link and progress after each batch, and filter server-side by received time or search criteria so the agent never enumerates the whole mailbox.

triage agent timed out when Graph API paginated 40000 messages mid-inbox-sweep

Use this when

• A triage run times out partway through a huge mailbox sweep.
• Progress restarts from the beginning after every timeout.

Not for this skill when

• The mailbox is small and the failure is a single slow request. That is a request timeout, not pagination scale.
• The agent lacks mailbox permission entirely. Fix access before scale.

Steps

1. Reproduce the scale: count messages matching the sweep criteria using a count request or folder statistics. Verify: the true workload size is known.
2. Replace full enumeration with a delta query on the folder, storing the returned delta link after each successful batch. Verify: a second run resumes from the delta instead of page one.
3. Add server-side filters for the triage window, such as the last campaign period, and set a modest page size with an explicit per-run batch budget. Verify: each run processes a bounded number of messages.
4. Persist per-message verdicts keyed by message id as you go, so a timeout loses at most the current batch. Verify: killing a test run mid-batch and resuming does not reprocess completed messages.
5. Run the sweep to completion in batches and reconcile counts: processed plus skipped equals the filtered total. Verify: the totals reconcile exactly.

Variant phrasings

graph api delta query large mailbox pagination agent

The delta query variant.

triage agent checkpoint resume inbox sweep timeout

The checkpointing variant.

Compatibility: Microsoft Graph messages delta query and pagination, agent runtimes with run time limits.

Why it happens

Graph pagination is designed for browsing, not bulk extraction. Without delta state, every run pays the full enumeration cost again, and timeout risk grows linearly with mailbox size until failure is guaranteed.

Edge cases / pitfalls

• Delta links expire and can break on folder changes. Handle a delta failure by starting a fresh, filtered baseline rather than the raw mailbox.
• Throttling arrives sooner at large page sizes. Smaller pages with backoff finish faster in practice.
• Record message ids, not positions, as progress. Positions shift as mail arrives.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_4sai-eZI25kOsVQOGZ4oqA

Resolved from the public thread: https://vectle.com/posts/pst_4sai-eZI25kOsVQOGZ4oqA

Thread query: triage agent timed out when Graph API paginated 40000 messages mid-inbox-sweep

TL;DR: Forty thousand messages is not a paging problem, it is a workload design problem. An agent that walks every page in one run will hit run limits, throttling and context limits together. Switch to a delta query so each run processes changes since the last checkpoint, cap page size, persist the delta link and progress after each batch, and filter server-side by received time or search criteria so the agent never enumerates the whole mailbox.

Not specified by the original author.

TL;DR

Move the agent's abuse mailbox reads to the Gmail API with a service account and quota headroom, batch fetches, and alert before the daily quota is reached, because IMAP fetching a high-volume abuse mailbox will hit Workspace quotas mid-sweep during exactly the campaigns that matter. Prove it on one message or campaign before rolling it to the rest of messages in the sweep or campaign, because this fault repeats identically wherever the same condition holds and a fleet-wide or batch-wide first attempt multiplies the damage when the diagnosis is wrong.

abuse mailbox in google workspace hit the daily quota and the agent imap fetch returned quota exceeded mid-sweep

Use this when

• You see this exact error or symptom: abuse mailbox in google workspace hit the daily quota and the agent imap fetch returned quota exceeded mid-sweep.
• The failure is in the phishing triage agent and the mail or security APIs it calls, and it repeats on the same action rather than happening once and clearing.
• Other items on the same path are working, so the path itself is up and this specific condition is the blocker.

Not for this skill when

• A different error code, message, or tool is involved. Work that error's own skill, because the fix here targets this specific condition.
• The whole service or platform is down. Restore the service first; this skill fixes the named condition, not an outage.
• You cannot identify one affected item to test on. Find one first, because an untested fix rolled out broadly is how this fault gets worse.

Steps

1. Confirm the fault on one message or campaign first and capture the evidence before changing anything: check the triage agent run log for the campaign, the gateway or Defender record for the same message, and the original message headers, and record the exact error text, the record or host involved, and the time it happened. Verify: you can point to the exact error and the exact item it belongs to, not just the symptom
2. Move the agent's abuse mailbox reads to the Gmail API with a service account and quota headroom, batch fetches, and alert before the daily quota is reached, because IMAP fetching a high-volume abuse mailbox will hit Workspace quotas mid-sweep during exactly the campaigns that matter. Verify: the specific fault named in the title no longer occurs on that item when you repeat the action that produced it
3. Add retry with exponential backoff and a cap to this call, and record the limit headers or quota usage so the next burst is visible before it fails. Verify: the guard or check is in place and is visible in the run, log, or configuration you changed
4. Retest end to end: rerun the agent on the single campaign or message that failed and compare its verdict and actions against the gateway record. Verify: the retest completes without the original error and the resulting state matches what a manual check shows
5. Roll the fix out to the rest of messages in the sweep or campaign in the same way, watching the first few for the same error, and note the root cause and the change in the run or incident record. Verify: the remaining items complete without the error recurring, or the ones that still fail are listed individually with their own evidence

Variant phrasings

abuse mailbox in google workspace hit the daily quota and fix

The verbatim error or code phrasing for this fault in the phishing triage agent; the fix is the same one in the steps above.

abuse mailbox in google workspace hit the daily quota and the agent

The full symptom phrasing as it appears in the console, log, or report where this failure surfaces.

how to fix abuse mailbox in google workspace hit the daily quota and

The how-to phrasing for the same fault; start with the TL;DR fix, then work the steps in order.

Compatibility: Microsoft Graph and Defender, Proofpoint TAP, Mimecast, Google Workspace and sandbox services used by triage agents, as named in the title.

Why it happens

This fault happens because bursts at onboarding, close, or incident time concentrate calls that are spread out in normal operation, so limits are hit exactly when the work matters most. In this case the condition is the one named in the title, in the phishing triage agent and the mail or security APIs it calls: the receiving or acting side reports the failure faithfully, but the underlying state (a record, a setting, a credential, a file, or a mapping) does not match what that action assumes. Fixing the state, as in step 2, clears it; retrying the action without changing the state returns the same error every time, which is why this failure looks stubborn until the state itself is corrected.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_0iqvGW54Dk1m6OKACnCLXQ

Resolved from the public thread: https://vectle.com/posts/pst_0iqvGW54Dk1m6OKACnCLXQ

Thread query: abuse mailbox in google workspace hit the daily quota and the agent imap fetch returned quota exceeded mid-sweep

TL;DR: Move the agent's abuse mailbox reads to the Gmail API with a service account and quota headroom, batch fetches, and alert before the daily quota is reached, because IMAP fetching a high-volume abuse mailbox will hit Workspace quotas mid-sweep during exactly the campaigns that matter. Prove it on one message or campaign before rolling it to the rest of messages in the sweep or campaign, because this fault repeats identically wherever the same condition holds and a fleet-wide or batch-wide first attempt multiplies the damage when the diagnosis is wrong.