This blocklist is technically online but receives inconsistent maintenance. Its deliverability impact is lower than actively maintained lists.
What it is
SWINOG (Swiss Network Operators Group) operated a DNSBL as part of their network infrastructure tooling. The list was used within Swiss internet and academic networks to filter spam sources.
How it affects SMTP delivery
SWINOG's DNSBL has seen reduced maintenance and is less actively deployed than during its peak years. It may still be queried by legacy configurations in Swiss infrastructure.
What causes a listing
Historical listings reflected spam activity detected within the SWINOG network.
How to get removed
Contact SWINOG via their official channels. Response times and removal availability are inconsistent.
For the full reference catalog, see the email blocklist directory.
Delisting process in detail
The Swinog blocklist (dnsrbl.swinog.ch) is operated by the Swiss Network Operators Group (SwiNOG). Delisting is handled through swinog.ch’s contact form. Response times are typically within 24-48 hours for well-documented requests. Because Swinog is operated by a volunteer group focused on the Swiss mail community, response can be slower during off-hours but is generally responsive to legitimate senders providing clear remediation documentation.
Prevention practices
Swinog prevention follows standard anti-abuse fundamentals. Because the blocklist is regionally focused, senders reaching Swiss and European recipients should monitor it specifically alongside major global blocklists. Swiss ISPs and mail providers may query Swinog directly, so a listing there can affect delivery in the region even when other reputation signals remain clean. Authentication, list hygiene, and complaint monitoring are the primary prevention practices.
Common listing causes
Swinog listings correlate with actual observed spam sending to Swiss recipients. Common patterns include purchased lists containing Swiss addresses, compromised shared-hosting accounts, and coordinated spam campaigns targeting German-speaking recipients. For legitimate senders operating in the Swiss market, confirmed opt-in and list hygiene are the primary prevention practices; Swinog is a smaller list with limited honeypot coverage, so listings usually indicate specific abuse patterns rather than broad reputation issues.
Related blocklists
Swinog operates alongside other regional European blocklists: Nether (also Swiss-operated), NIX Spam (German-speaking community), Nordspam (Nordic), Konstant (Norwegian). Enterprise senders reaching European recipients should monitor these regional lists alongside Spamhaus and Barracuda for comprehensive coverage. Swinog’s regional focus means its impact is concentrated in Swiss and German-speaking delivery; broader impact requires listings on major global blocklists.
About the Author
Alaa · LinkedIn
Email infrastructure specialist with 8+ years of hands-on experience in SMTP, deliverability, and email verification. I’ve configured and troubleshot mail systems across Postfix, Exchange, and cloud relays, managed IP reputation and warmup campaigns, and built verification pipelines processing millions of addresses. My work spans DNS authentication (SPF, DKIM, DMARC, BIMI), bounce handling, blocklist monitoring, and compliance frameworks including CAN-SPAM and GDPR. I write every article on SMTPedia to give email professionals, developers, and marketers the accurate, RFC-grounded reference they need.
About SMTPedia
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