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Anomaly alert: email bounce rate spike after a send

One of 565 written HubSpot workflow specs, by a collective of independent HubSpot consultants.

Professional

Seat pricing: Professional edition. To build it, a GTM Seat or an Ops Seat (an Ops Seat cannot create marketing emails or sequences). Per-hub plans: Data Hub Professional.

Contact3 stepsUpdated for HubSpot seat pricing
OutcomeShortly after each marketing email send, an admin gets a Slack alert only if that send's bounce rate is well above the portal's recent historical average, so a bad list segment or a deliverability problem is caught within hours, not at the next monthly review.
Workflow mapreporting-alerts-025
Marketing email send completes leads to Wait 3 hours. Wait 3 hours leads to Custom code: fetch this send's stats and 30-day baseline. Custom code: fetch this send's stats and 30-day baseline leads to Recipient floor met and bounce rate above threshold?. Recipient floor met and bounce rate above threshold? leads to yes: Post Slack alert naming the email and rate; no: Exit silently. yes no Marketing email send completes Wait 3 hours Custom code: fetch this send's stats and 30-day baseline Recipient floor met and bounce rate above threshold? Post Slack alert naming the email and rate Exit silently
Marketing email send completes leads to Wait 3 hours. Wait 3 hours leads to Custom code: fetch this send's stats and 30-day baseline. Custom code: fetch this send's stats and 30-day baseline leads to Recipient floor met and bounce rate above threshold?. Recipient floor met and bounce rate above threshold? leads to yes: Post Slack alert naming the email and rate; no: Exit silently. yes no Marketing email send completes Wait 3 hours Custom code: fetch this send's stats and 30-day baseline Recipient floor met and bounce rate above threshold? Post Slack alert naming the email and rate Exit silently

One of 565 written HubSpot workflow specs, by a collective of independent HubSpot consultants.

When to use it, when not to

Use it

  • Use it on portals sending regular marketing email campaigns where deliverability matters, sender reputation, domain health.
  • Use it to catch a send to a stale or purchased list segment, a broken personalization token causing bounces, or a sudden domain-level blocking event.
Read more on when to use itShow less

Skip it

  • Do not use it for very low-volume sends, a handful of recipients, where one or two bounces look like a huge percentage spike without being a meaningful signal. Set a minimum recipient-count floor.
  • Do not treat this as deliverability monitoring on its own. Pair it with the sending domain's actual authentication status (SPF, DKIM, DMARC) checks, which this fiche does not cover.
Read more on when to skip itShow less

The rest of this spec

Prerequisites · 4 items

Every property with its label, internal name, type and options, plus the assets the workflow needs.

Enrollment · 4 parts

The trigger, the criteria as ticked in the UI, the re-enrollment rule and the suppression list.

Steps · 3 numbered actions

Each action in order with its parameters, branches and delays.

Known pitfalls · 5

Traps seen in production, each with what breaks and what to do instead.

Test plan and UAT script · 1 case, 3 variants

How to prove it works in a test portal, one case per branch, and a sign-off sheet.

Files · PDF, Markdown, JSON, CSV, code

The properties JSON creates the fields in one call. The workflow JSON documents the build. The custom coded action ships as a ready-to-paste .js file.

Install · 1 click, switched off

The installer creates the properties and the workflow, switched off, then opens a task for what it cannot create. Nothing is deleted, enabled or enrolled.

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One-time, excl. VAT. 30-day refund. Installs in 3 portals. Founding price until 30 November.

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