> ## Documentation Index > Fetch the complete documentation index at: https://docs.vortexiq.ai/llms.txt > Use this file to discover all available pages before exploring further. # Spam Complaint Rate, Mailchimp > abuse_reports / emails_sent. Above 0.1% Gmail / Yahoo de-prioritise the sender domain. MC-DEL-002 fires. How to read it, why it matters, and how to act on it. **Metrics type:** [Key Metrics](/nerve-centre/overview#metrics-types-explained) • **Category:** [Email Marketing](/nerve-centre/connectors#connectors-by-type) > abuse\_reports / emails\_sent. Above 0.1% Gmail / Yahoo de-prioritise the sender domain. MC-DEL-002 fires. ## At a glance > The percentage of recipients who marked an email as spam, aggregated across every campaign and Customer Journey email in the period. Computed as `SUM(abuse_reports) ÷ SUM(emails_sent) × 100`. **Above 0.1% Gmail and Yahoo de-prioritise your sender domain immediately**, and Mailchimp's own Compliance team flags accounts at sustained 0.05%+ for review. Audit MC-DEL-002 fires here. Spam-complaint rate is the strictest deliverability number you have, an order of magnitude tighter than bounce rate. | | | | ------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **What it counts** | `SUM(reports.abuse_reports) ÷ SUM(reports.emails_sent) × 100` across every campaign + Customer Journey email in the period. | | **API endpoint** | Marketing API v3, `GET /3.0/reports/{campaign_id}` returns `abuse_reports` (integer count). Customer Journey emails use `GET /3.0/automations/{workflow_id}/emails/{email_id}/reports`. | | **What "abuse" means** | Recipient clicked "Mark as spam" / "Report spam" in their email client, AND their ISP forwarded the complaint via Feedback Loop (FBL) to Mailchimp. Gmail, Yahoo, AOL, Outlook all participate in FBL; some smaller ISPs don't, so the figure is a lower bound. | | **Audience-based scope** | Aggregates across every audience. Per-audience complaint rate (in [Audiences Overview](/nerve-centre/kpi-cards/mailchimp/audiences-overview)) often shows new-imported audiences dramatically higher, those subscribers don't recognise the sender. | | **Channel scope** | **Email only.** SMS doesn't have an equivalent. | | **Hard threshold significance** | Gmail's published threshold is 0.1% (1 complaint per 1,000 sends). Yahoo's is 0.3%. Mailchimp Compliance reviews at 0.05% sustained. **A single bad campaign can push you over for the day even if 30D average is healthy**, watch the per-campaign view, not just the aggregate. | | **MPP impact** | None. MPP affects opens, not clicks-on-spam-button. | | **Bounce handling** | Bounces don't count as complaints. The denominator (`emails_sent`) excludes bounces; the numerator (`abuse_reports`) only includes deliberate spam-flag actions. | | **Attribution model** | Not applicable. | | **Currency** | Not applicable. | | **Time window** | `30D vsP` (default 30D vs the prior 30D) | | **Alert trigger** | `>0.1%` (drives `sentiment_key: spam_rate`). MC-DEL-002 fires here. The 0.1% threshold is the lower of "Mailchimp Compliance flag" and "Gmail throttle"; treat it as red-line. | | **Roles** | owner, marketing, engineering | ## Calculation Calculated automatically from your Mailchimp data. See the At a glance summary above for what the metric tracks and the worked example below for a typical reading. ## Worked example A small DTC home-fragrance brand running on Shopify with Mailchimp Standard, single consumer audience of 28,000. Window 03 Apr 26 to 02 May 26. | Campaign | Sent | Spam complaints | Complaint % | | ---------------------------- | ---------- | --------------- | ----------- | | Spring scents launch | 27,200 | 8 | 0.029% | | Mother's Day promo | 27,400 | 14 | 0.051% | | Re-engagement series email 1 | 6,400 | 32 | 0.500% | | Welcome (Customer Journey) | 1,180 | 1 | 0.085% | | **Account total** | **62,180** | **55** | **0.088%** | Five observations: 1. **The headline 0.088% is just under the 0.1% red-line, with no safety margin.** One single complaint-heavy send tips the account over. The re-engagement campaign at 0.5% is doing all the damage; without it, the rest of the account would be at a healthy 0.04%. 2. **Re-engagement campaigns ALWAYS spike complaint rate.** Recipients who haven't engaged in months don't recognise the sender, and "Mark as spam" is a faster path to silence than finding the unsubscribe link. **Re-engagement is a calculated trade**, you accept a complaint-rate spike in exchange for a cleaner go-forward list. The mistake is sending re-engagement at full audience volume; small batches (\<2,000 at a time) keep the complaint count below FBL-trigger thresholds. 3. **One Mother's Day complaint moved the rate by 0.004 pp.** That sounds tiny but accumulated across the period it's the difference between safe and flagged. **Spam complaint rate is brutally sensitive at small numbers.** A 28,000-subscriber list only needs 28 total complaints in a 30D window to breach 0.1%. 4. **The Welcome Customer Journey at 0.085% is unusual.** Welcome emails should complain at 0.01-0.03% because recipients just opted in and remember signing up. 0.085% on a Welcome suggests either (a) the signup form lacks a clear "you'll receive marketing emails" notice, or (b) the from-name doesn't match the brand name on the website (e.g. signed up at "Brand X" but the email comes from "Marketing Team @ ParentCo"). 5. **Gmail's threshold is 0.1% but Mailchimp Compliance reviews at 0.05% sustained.** Even with the headline at 0.088%, this account is in Mailchimp's risk zone. Compliance may issue a list-cleanse notice that requires action within 7 days. The fix here is stop the re-engagement campaign and split it into smaller weekly batches. ## Sibling cards merchants should reference together Spam rate is the strictest deliverability number; pair these: | Card | Why pair it with Spam Complaint Rate | | ------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------------------------------------------------------------------- | | [Mailchimp Bounce Rate](/nerve-centre/kpi-cards/mailchimp/bounce-rate) | The other half of the deliverability pair. ISPs throttle on EITHER bounce >5% OR spam >0.1%. Both must stay green. | | [Mailchimp Unsubscribe Rate](/nerve-centre/kpi-cards/mailchimp/unsubscribe-rate) | Trades against complaints, recipients who unsub don't complain. A clear unsubscribe link in every email pulls complaint rate down. | | [Mailchimp Suppressed Members](/nerve-centre/kpi-cards/mailchimp/suppressed-cleaned-members) | Spam-complainers are auto-suppressed by Mailchimp. Watch for sudden suppression spikes after a complaint-heavy send. | | [Mailchimp Email-Attributed Revenue](/nerve-centre/kpi-cards/mailchimp/email-attributed-revenue) | Revenue follows deliverability with a 2-3 week lag. Spam breaches today predict revenue dips later. | | [Mailchimp Open Rate](/nerve-centre/kpi-cards/mailchimp/email-open-rate) | If opens fall and complaints rise together, the audience genuinely doesn't want the content. Both signal "stop sending until cleansed". | | [Mailchimp Audience Growth Rate](/nerve-centre/kpi-cards/mailchimp/audience-growth-rate) | Fast list growth from low-quality sources (paid leads, list rentals) drives complaints. Watch growth and complaint rate together. | | [Mailchimp Sender Reputation Alert](/nerve-centre/kpi-cards/mailchimp/sender-reputation-risk) | Composite alert (bounce >5% OR spam >0.1%). Treat as one early-warning signal. | | [Mailchimp Spam Spike Alert](/nerve-centre/kpi-cards/mailchimp/abuse-spam-complaint-spike) | The 24-hour anomaly detector. Catches a single bad campaign before the 30D rate notices. | ## Reconciling against the vendor's own dashboard **Where to look in Mailchimp's own dashboard:** [Mailchimp → Campaigns → Reports → individual campaign → Performance tab](https://us1.admin.mailchimp.com/reports/) for per-campaign abuse complaints, with a complaint count and rate. [Mailchimp → Audience → Audience Health](https://us1.admin.mailchimp.com/audience/) shows audience-level complaint trends. Other Mailchimp views that *look* like the same number but aren't: * **Account → Sender Reputation**: blended reputation score, includes complaints + bounces + engagement. Not the same as complaint rate alone. * **Campaigns → individual report → "Subscribers who clicked Mark as Spam"**: a list of complainers, useful for investigation but not the rate. **Why our number may legitimately differ from Mailchimp's dashboard:** | Reason | Direction of divergence | | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------- | | **Time-zone**. Mailchimp uses account timezone; Vortex IQ uses UTC. | ±0.005 pp at the boundary | | **FBL latency**. Some ISPs (notably Microsoft) batch Feedback Loop reports. A complaint clicked yesterday may not appear in Mailchimp's data for 2-12 hours. | None on a 30D total; up to ±0.01 pp on the 7D view | | **Page caps**. Engine pages campaigns 10 per call up to 5 pages. >50 distinct sends per 30D shows truncation. | Vortex IQ slightly off for high-cadence senders | | **Customer Journey aggregation**. Per-journey rollup in Mailchimp UI sometimes averages complaint rate across email steps; Vortex IQ pulls per-step counts and sums. | None on the headline | | **Anonymous complainers**. Some ISPs strip the recipient address from FBL reports for privacy; Mailchimp counts the report but can't suppress the address. The complaint rate is correct but the suppression list grows slower than expected. | None on this rate; affects suppression count | **Cross-connector reconciliation:** Spam complaint rate is a Mailchimp-internal deliverability metric. Closest cross-references: | Card | Expected relationship | What causes legitimate divergence | | ------------------------------------------------------------------------------ | ----------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------- | | Gmail Postmaster Tools (no connector) | Gmail's "User-reported spam rate" should track within ±0.05 pp of this card's Gmail-only slice. | Postmaster reports per-domain; Mailchimp aggregates across all ISPs. | | [`klaviyo.klv_spam_rate`](/nerve-centre/kpi-cards/klaviyo/spam-complaint-rate) | When both ESPs run on the same store, rates should track within ±0.03 pp. | Different segmentation strategies expose different parts of the audience. | ***
Documentation cross-reference (for agencies running multiple email platforms) Spam complaint rate exists on every email platform. References for cross-doc linking only. * [`klaviyo.klv_spam_rate`](/nerve-centre/kpi-cards/klaviyo/spam-complaint-rate)
## Known limitations / merchant FAQs **Why is my complaint rate so much stricter than my bounce rate threshold?** Bounces are SMTP-layer (delivery failures, often technical). Spam complaints are recipient-action (intentional "this is unwanted"). ISPs treat complaints as a much stronger negative signal because they carry direct user intent. Gmail's threshold is 0.1% (1 complaint per 1,000 sends). Bouncing 1 in 1,000 is fine; 1 spam complaint per 1,000 means 1 person consciously rejected your email, which is enough for Gmail to start inboxing your future sends to spam. **What's a healthy steady-state complaint rate?** For consumer DTC, 0.01-0.04% is healthy. For B2B, 0.005-0.02% (lower because corporate users complain less, they delete or filter). Charity / non-profit lists run lower again, around 0.005%. **The 0.1% alert threshold is the upper limit before Gmail throttles**, not a target. If you're consistently in the 0.05-0.08% band, you have a list-quality problem that hasn't bitten yet. **My complaint rate spiked after a re-engagement campaign, is that normal?** **Yes**, expected. Re-engagement campaigns pull dormant subscribers back into the inbox; many of those subscribers have forgotten signing up and "Mark as spam" is faster than "Unsubscribe". The strategic answer: split re-engagement into batches of \<2,000 over a 4-6 week window, monitoring complaint rate after each batch. The tactical answer: include "We noticed you haven't engaged in a while" copy in the email and put the unsubscribe link in the FIRST paragraph, not the footer. **Why don't I see all my complaints in Mailchimp?** Some smaller ISPs (Apple, smaller corporate domains) don't participate in Feedback Loop, so complaints from those recipients aren't reported. Mailchimp's count is a lower bound of total complaints. The figure is still useful as a relative metric over time even if absolute count is incomplete. **Will Mailchimp suspend my account if I cross 0.1%?** Not immediately at 0.1%, but Mailchimp Compliance reviews accounts at sustained 0.05%+. Crossing 0.1% on a single campaign typically triggers an automated email asking for action; sustained 0.1% over 30 days can lead to send-pause. Mailchimp's TOS requires accounts to stay under 0.5% complaint rate as a hard ceiling. **A subscriber complained but said they didn't, how is that possible?** Three causes: (a) shared mailbox where someone else clicked spam; (b) mobile mail apps where "Archive" and "Spam" buttons are visually adjacent and easily confused; (c) Gmail's "Move to spam" suggestion for low-engagement senders, some users follow the prompt without thinking. None of these are reversible at the FBL layer; the report stands regardless of intent. **Does this card include Customer Journey complaints?** **Yes.** Both regular campaigns and Customer Journey email-step complaints sum into this rate. Welcome emails should complain at \<0.03%; abandoned-cart emails at 0.05-0.10% (slightly higher because abandoners often weren't sure they wanted marketing in the first place). **Should I worry about a single complaint on a 200-recipient send?** Mathematically yes, that's 0.5% on the campaign. Practically, **Mailchimp's API rounds rates per-campaign**, and small-list complaint rates are noisy. Look at the 30D blended rate, not single-campaign figures, for trend-tracking. But for compliance and Compliance review, even small-list breaches can trip flags. **My account uses a custom domain via Mailchimp Authentication, does that affect complaints?** The complaint rate is the same but the impact is contained. With a custom authenticated subdomain, complaints harm that subdomain's reputation only and don't bleed into your primary store domain. This is essential for any merchant sending >100k/month, set up authentication before complaint rate becomes a problem, not after. *** ### Tracked live in Vortex IQ Nerve Centre *Spam Complaint Rate* is one of hundreds of KPI pulses Vortex IQ tracks across Mailchimp and 70+ other ecommerce connectors. Nerve Centre runs the detection layer; Vortex Mind investigates the cause when something moves; Ask Viq lets you interrogate any number in plain English. [Start for free](https://app.vortexiq.ai/login) or [book a demo](https://www.vortexiq.ai/contact-us) to see this metric running on your own data.