sender.report is an email deliverability diagnostic tool, not a bulk email or transactional email sending platform. After users send a test email to a temporary mailbox, the system analyzes SPF, DKIM, DMARC, Spam-Score, DNS, email formatting, and headers within seconds, then generates a 0-10 score report. The page states that it is Open Source and self-hostable, with a Docker Image that includes the Web UI, SMTP receiver, and database.
For email authentication, it covers key checks such as SPF, DKIM, DMARC, policy strength, alignment, and DKIM key length, making it useful for troubleshooting compliance issues related to sender domain requirements from Gmail, Outlook, Yahoo, and other mailbox providers. Infrastructure checks include PTR/rDNS, HELO, MX, A/AAAA, TLS, MTA-STS, TLS-RPT, DNSSEC, BIMI, and DANE/TLSA. Reputation and anti-spam checks include SpamAssassin, Rspamd, DNSBL/RBL, plus optional domain age, domain blacklist, and link blacklist checks. At the content level, it also reviews MIME, HTML, text/HTML ratio, subject line, short links, List-Unsubscribe, Message-ID, Date, and the Received-Chain.
The scraped text does not disclose its pricing model, free quota, or commercial support options. For integrations, the text explicitly mentions JSON export and API access, but does not provide interface details. For technical teams, its self-hosting capability is more valuable: it can be deployed on your own infrastructure, reducing the risk of sensitive email content being exposed externally.
Its strengths are that it requires no registration, works instantly with a temporary mailbox, covers a broad range of checks, and emphasizes privacy: the report link acts as the key, mailboxes automatically expire and are deleted, and there are no Tracking Cookies, CDN, or third-party tracking scripts. The downside is that it is primarily a diagnostic tool and does not provide an email sending channel or real inbox placement monitoring for Gmail/Outlook. Advanced reputation checks call external services; although they are disabled by default, they should still be assessed for scenarios with extremely high privacy requirements.
It is suitable for self-hosted SMTP administrators, SaaS development teams, enterprise IT teams, and email marketing operations teams to use before launch or during troubleshooting. The text does not mention access from China, so it is unclear whether direct connectivity is available; payment methods are also not disclosed. If you need a commercial email sending service or alternatives usable in China, consider enterprise email providers, SendCloud, ้ฟ้ไบ้ฎไปถๆจ้, ่ พ่ฎฏไบ้ฎไปถๆจ้, and similar services. If you only need deliverability testing, you can compare it with Mail-Tester, MXToolbox, and GlockApps.
โ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on vizzywig.de official site.
vizzywig.de is an Germany Comms & Email provider. TG4G tracks its product information, an overall rating of 6.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach vizzywig.de directly.