AWS's authoritative DNS service, launched in 2010, billed per zone and per query. Supports DNSSEC, routing policies (latency, geolocation, failover) and domain registration, and integrates with Amazon SES for automatic publication of DKIM records and verified identities.
Ecosystem directory
Organizations, events and solutions of the email ecosystem. Every entry is verified and dated.
DNS
DNS hosts and name servers, where SPF, DKIM, DMARC and MX records live.
The reference DNS server, developed since the 1980s and maintained by the Internet Systems Consortium under the MPL 2.0 licence. Both authoritative and recursive, it remains the most deployed DNS software. The bind-utils / dnsutils package provides the dig command line tool, used to query MX, TXT (SPF, DMARC) and PTR records.
Cloudflare's authoritative DNS service, free in its basic tier and among the most used worldwide. Offers one-click DNSSEC, an API and wizards for email records (SPF, DKIM, DMARC), plus Email Routing to forward a domain's addresses. Also runs the 1.1.1.1 public resolver.
Free, non-profit DNS host based in Berlin, backed by SSE and born out of academic research, enforcing DNSSEC on every zone. REST API, dynamic DNS and software under a free licence. Suited to personal projects and organisations wanting secure-by-default DNS.
US managed DNS provider founded in 2002, known for its uptime, with an anycast network, DNSSEC, automatic failover and an API. Aimed at businesses and hosting companies wanting authoritative DNS independent of their host. The same group publishes Constellix.
DNS provider and registrar founded in 2010, developer-oriented, with a REST API, zone templates, DNSSEC and one-click services for configuring third-party platform records (including email). Publishes widely used public documentation on DNS records.
Tool for analysing and visualising a name's DNS resolution chain and DNSSEC validation, originally developed at Sandia National Laboratories and available online and as open source software. Useful for diagnosing delegation or signing errors that prevent email records from resolving.
French registrar founded in 1999, also a DNS provider (LiveDNS with DNSSEC), hosting and mailbox provider. Acquired by Total Webhosting Solutions in 2023. Known for supporting many domain extensions and for its API.
Managed DNS service founded in 2013 as NS1 and acquired by IBM in 2023. Enterprise-oriented with rule-based traffic steering, multi-provider redundant DNS, a full API and DNSSEC. Used by sending platforms for high-traffic zones.
Open source authoritative DNS server, GPL licensed, developed by CZ.NIC, the .cz registry, and used by several registries and root server operators. Designed for high performance with automatic DNSSEC signing. Its resolver counterpart is Knot Resolver.
Dutch open source DNS software, GPL licensed: an authoritative server with database back ends, a recursive resolver and dnsdist (a DNS load balancer). Published by PowerDNS.COM BV, a subsidiary of Open-Xchange, with commercial support. Widely used by hosting providers and operators.
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