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MigoSMTP
Reputation & Blacklist Monitoring

Watch your reputation before it costs you inboxes

Track blocklists, complaints and authentication health, with alerts and clear next steps.

AI risk scoring warns of reputation drift and explains the fix in plain steps.

Add monitoring
Domain
example.com
IP
203.0.113.10
Monitor
Monitoring on
Domains
IPs
Tell us what to watchAdd the domains and IPs you send from. Monitoring starts immediately and keeps history.
List A
Clear
List B
Clear
List C
Listed
List D
Clear
List E
Clear
List F
Clear
203.0.113.10
Every hour
Instant alert
Checked against blocklistsYour IP and domain are queried against the lists that mailbox providers rely on, around the clock.
Reputation score
Poor
Good
Auth passing
Blocklists clear
Complaints low
Composite
Trend
One score you can trustAuthentication, complaints, bounces and engagement combine into a single reputation score.
Day 1
Day 2
Day 3
Day 4
Day 5
Day 6
Gmail
!
Outlook
!
Yahoo
!
Other
!
Inbox
Promotions
Needs attention
Per provider
Daily
See each provider's viewPlacement and feedback differ by provider. The heat map shows which one is slipping first.
Reputation trend · [domain]
AI
30 days
Forecast
Likely to dropComplaints are rising on one cold segment.
Suggested: pause that segment and send only to recent openers
Predictive alerts
Likely cause
Predict a reputation dip before it happensAI tracks complaint, bounce and engagement trends and warns when a score is on course to drop. It names the likely cause so you can act early.
Day 1Pause risky streams
Day 2Clean the list
Day 4Resume slowly
Day 10Ramp up
Day 21Back to normal
Guided
Measured
A recovery plan when it dipsIf reputation drops, a staged plan cuts volume, cleans lists and rebuilds trust step by step.
Add assets
Blocklists
Score
Providers
AI forecast
Recovery
SMTP relayREST APIWebhooksDedicated IPsDKIM signingInbound parseTemplatesAnalyticsSuppression listsReputation monitoringEmail validationTeam roles and audit logSMTP relayREST APIWebhooksDedicated IPsDKIM signingInbound parseTemplatesAnalyticsSuppression listsReputation monitoringEmail validationTeam roles and audit log
Capabilities

Early warnings, plain explanations

Blocklist monitoring

Daily checks of your IPs and domains across major lists.

Complaint tracking

Follow complaint rates by domain and stream.

Authentication health

Spot SPF, DKIM or DMARC regressions.

Alerts

Email or webhook when a threshold is crossed.

Recommended fixes

Each issue links to the step that resolves it.

Delisting guidance

Know how to request removal and what to fix first.

How it works

Your domains and IPsAdd everything you send from.
MigoSMTP monitorWatches blocklists, complaint rates and authentication health.
Alerts with next stepsEmail and webhook alerts explain the likely cause and the fix.
STEP 1

Add domains and IPs

Everything you send from is monitored automatically.

STEP 2

Set your thresholds

Choose when you want to be alerted.

STEP 3

Act on the findings

Follow the guidance attached to each alert.

See it in action

One platform from first send to inbox

Switch between stages to see what you control at each step. Illustrative interface. Figures reflect the scale we run, not a live feed.

app.migosmtp.com / sendPlatform scale
Queued
184,320
Sent today
6,418,905
Rate
412/s
acceptedmessage to you@example.com
acceptedmessage to team@example.com
queuedbatch of 25,000 recipients
acceptedmessage to ops@example.com
Prevention

Fix issues while they are still small

A listing or a rising complaint rate rarely appears without warning. The monitor makes the warnings visible.

  • Domain and IP checks
  • Threshold alerts by email or webhook
  • History to see what changed
  • Free blacklist check tool for quick lookups
At a glance
MonitorsBlocklists, complaints, authentication
AlertsEmail and webhook
HistoryDepends on plan
CoverageBlocklists listed per IP and domain in the monitor
Overview

What is reputation and blacklist monitoring?

Email reputation monitoring is the continuous tracking of the signals that decide whether mailbox providers trust your mail, including blocklist listings, complaint rates and authentication health. MigoSMTP monitors your sending IPs and domains, checks them against major blocklists, and alerts you by email or webhook when a threshold is crossed or an address is listed. Checks run automatically on a schedule, so nobody has to remember to look, and results are kept as history you can compare against later.

You add your domains and IPs, set the thresholds that matter to you, and follow the guidance attached to each alert. Authentication monitoring spots regressions in SPF, DKIM or DMARC, such as a record that stopped aligning after a DNS change. History shows what changed and when, and the free blacklist check tool handles quick lookups. Thresholds are yours to set, and alerts can go to a person, a shared mailbox or a webhook that opens a ticket automatically.

Reputation problems rarely appear without warning. A rising complaint rate or a minor listing precedes broader blocking, and fixing them while small protects inbox placement. Our AI features score risk, explain the likely cause of each alert in plain English and suggest next steps, while leaving decisions to your team. Used with analytics and warmup, monitoring gives a complete view of what is helping or hurting your standing at each provider.

Use cases

Common reputation and blacklist monitoring use cases

Catching a listing early

Daily checks flag when a sending IP appears on a blocklist. You see which list, why it is likely, and what to fix before requesting removal.

Watching complaint rates by stream

Track complaints separately for marketing and transactional streams. If marketing complaints climb, you can pause or segment that stream before it affects critical messages. Isolation protects what matters most.

Detecting broken authentication

After a DNS migration, monitoring shows if SPF or DKIM stopped passing for part of your traffic, so you correct it before mailbox providers start filtering.

Protecting a new IP during warmup

Pair reputation alerts with a warmup plan. If signals turn bad during the ramp, you hear about it the same day and can slow volume.

Auditing a client or acquired domain

Add a domain you have just taken on and see its blocklist status, authentication health and complaint signals before you send anything.

Reporting reputation to stakeholders

Use the monitor history to show leadership or clients how reputation has moved, and what you changed when it did.

Choosing a method

Continuous monitoring or a one-off check?

A free lookup answers one question once. Monitoring tells you when something changes.

Reputation monitorFree blacklist check
Best forOngoing sending from your own domains and IPsA quick look at one IP or domain
FrequencyContinuous, with alertsWhenever you run it
SignalsBlocklists, complaints and authenticationBlocklist status
GuidanceLikely cause and removal steps in each alertResult of the lookup

The free check is useful for investigating a single address. The monitor is what protects day-to-day sending.

AI features

AI-assisted reputation and blacklist monitoring

Risk

AI risk scoring

A reputation risk score combines complaint trends, bounces, authentication health and listing signals into one indicator with the factors behind it. You set the level at which alerts fire.

Copilot

Root-cause explainer

When an alert fires, the copilot lists likely causes, such as a stale segment or a missing DKIM selector, and links the relevant guide. You verify and act on it.

Predictive

Drift forecasting

Trend models project whether a complaint or bounce rate is heading toward your threshold, giving you notice before the line is crossed. Forecasts are estimates, not guarantees.

Assist

Guided delisting

For listings, the assistant drafts the removal request and a checklist of fixes to complete first. You review the text and submit it yourself. Everything is reviewable afterwards.

AI features are assistive: they score, explain and draft, and your team decides what to change and what to submit.

Best practices

Best practices for reputation and blacklist monitoring

Fix the cause before delisting

Requesting removal without addressing the reason often leads to relisting. Remove bad addresses, stop risky sources and confirm authentication first.

Publish a DMARC policy and read reports

Start with monitoring, move to enforcement once aligned traffic is clean, and review reports for sources you did not know were sending.

Keep complaint rates low and visible

Include a clear unsubscribe and honour it quickly. Track complaints per stream so one problem list cannot hide in a healthy average.

Segment by engagement

Mail engaged contacts first and reduce frequency to inactive ones. Poor engagement is a quiet reputation drain that rarely triggers a listing on its own.

Use a free check for quick lookups

When a customer reports missing mail, check the sending IP and domain right away. It rules out or confirms a listing in seconds.

Monitor every sending domain and IP

Add all of them, including ones used rarely. A listing on a forgotten address is usually found only after mail fails.

FAQs

Reputation and blacklist monitoring: frequently asked questions

Listed on a blocklist and unsure what to do? Our team can review it with you.

What is email blacklist monitoring?

Email blacklist monitoring regularly checks whether your sending IPs or domains appear on blocklists used by mailbox providers, and alerts you if they do. Early notice lets you fix the cause and request removal before delivery suffers widely. Early alerts prevent surprises.

Which blocklists do you check?

The reputation monitor shows the lists checked for each IP and domain, and the free blacklist check tool lets you look up a single address. Coverage can differ by list type, so the monitor view shows the exact set that applies to your account.

What should I do if my IP is blocklisted?

Read the alert, which explains the likely cause and the removal steps for that list. Fix the underlying issue first, such as a compromised account or bad list, then submit the removal request. Re-check after a day or so. Wait a day before rechecking.

Can I check a single IP for free?

Yes. Use the free blacklist check tool to look up an IP or domain without setting up monitoring. Monitoring adds scheduled checks, history and alerts. Monitoring adds history, thresholds and alerts, so you hear about a listing without having to remember to look. Quick checks are helpful for ad hoc questions from colleagues and customers.

What is the difference between IP reputation and domain reputation?

IP reputation reflects the behaviour of mail sent from a specific address. Domain reputation follows your sending domain wherever it sends from. Mailbox providers use both, so monitor both, especially when you change providers or IPs. Both can move independently of each other.

How do I improve my sender reputation?

Authenticate with SPF, DKIM and DMARC, send only to people who want your mail, remove bounces and inactive addresses, keep complaints low and ramp volume gradually on new IPs. Consistency over weeks matters more than any single fix. Review the results every week.

How does AI help with reputation monitoring?

AI combines signals into a risk score, explains the likely causes of alerts, forecasts drift toward your thresholds and drafts delisting requests. You review and decide every action. Scores are guidance, not a guarantee of placement.

How long is reputation history kept?

History helps you see what changed around the time a problem began. How far back it goes depends on your plan, so check your plan details and export key reports if you need records for audits or post-incident reviews.

Start sending in minutes.

Create an account, add your domain and send your first email.