Marketing tools
Postwacht
Test email deliverability and get clear, practical fixes for authentication, reputation, server setup, content, and bulk-sender requirements.
- Category
- Marketing tools
- Stage
- Growth
- For
- Newsletter and bulk email senders, online shops, and domain administrators who want to improve email deliverability.
About
Free email deliverability test and spam checker: SPF, DKIM, DMARC, blacklists, spam score and unsubscribe headers.
Features
- Problem
- Senders lack a quick way to see how spam filters assess an email.
- How it works
- Users send a message to a randomly generated, one-time test address; Postwacht runs 20 checks in parallel and updates the report automatically.
- Result
- A score from 0 to 10 and a prioritized report, typically available within seconds.
- Why
- Testing a message as recipients receive it reveals issues across authentication, server setup, reputation, content, and bulk-sender requirements.
- Problem
- Technical findings can be difficult to interpret and repair.
- How it works
- Postwacht explains findings in plain language and provides matching DNS records to copy when possible, with setup instructions for IONOS, STRATO, Cloudflare, and Hetzner.
- Result
- A practical fix plan, followed by the option to test again.
- Why
- Concrete, prioritized guidance helps users act on test results instead of just identifying problems.
- Problem
- Problems with domain authentication or reputation may appear after an initial test.
- How it works
- With an account, Postwacht checks SPF, DKIM, DMARC, MX, MTA-STS, TLS, and blocklists daily and emails users when something changes.
- Result
- Senders can monitor up to 10 domains on the free account and receive change alerts.
- Why
- Ongoing checks can surface domain changes and deliverability risks between email tests.
- Problem
- Moving from a basic DMARC policy to stricter enforcement can risk blocking legitimate senders.
- How it works
- Postwacht analyzes DMARC reports and advises when it may be safe to progress from p=none through quarantine to reject, including which senders still fail.
- Result
- A guided, step-by-step DMARC rollout.
- Why
- Reviewing report data helps users understand their sending sources before tightening policy.
- Problem
- A technically sound message may still land in spam or fail to arrive at major providers.
- How it works
- Inbox tests send messages to test mailboxes at major providers and report whether they arrive in the inbox, spam, or not at all.
- Result
- A view of inbox placement across the tested providers.
- Why
- Testing placement at real mailboxes provides a delivery signal beyond configuration checks.
- Problem
- Users may need to inspect a domain or email header without running a full test email.
- How it works
- Postwacht provides standalone SPF, DKIM, DMARC, MX/TLS, BIMI, and blocklist checks, record generators, and an email-header analyzer without an account.
- Result
- On-demand checks and copy-ready SPF or DMARC records without signing up.
- Why
- Focused tools let users investigate individual records and message details independently.
Product questions
What does Postwacht do?
Postwacht tests email deliverability and domain configuration, then gives senders a score, plain-language findings, and practical fixes. It also offers domain monitoring, DMARC analysis, inbox tests, alerts, and standalone email-domain tools.
Who is Postwacht for?
Newsletter and bulk email senders, online shops, and domain administrators who want to improve email deliverability.
Screenshots
