Backup & Email
DNS & Mail Authentication
Authoritative DNS design with SPF, DKIM and DMARC rolled out in stages so mail stays deliverable and the domain becomes hard to spoof.
Capabilities
What we implement
- Zone audit and record cleanup
- Sending-source inventory
- Staged DMARC enforcement
- Failover and TTL strategy
Security
How it is hardened
- DNSSEC where the registrar supports it
- Registrar lock and access control
- MTA-STS and TLS-RPT
- DMARC aggregate report monitoring
Architecture
DNS and mail authentication chain
Every legitimate sending source is enumerated before policy changes, then authentication moves to enforcement in stages so mail never silently breaks.
01 · Registrar & zone
Registrar lockAuthoritative nameserversTTL strategyOwnership, contacts and transfer lock verified before any record work begins.
02 · Record hygiene
A / AAAA / CNAME auditStale record removalFailover recordsConflicting and orphaned records removed; TTLs lowered ahead of planned cutovers.
03 · Sending sources
Mail tenantMarketing platformApplication / CRM sendersEach source inventoried and explicitly authorised — nothing sends unlisted.
04 · Authentication
Alignment verified with real message headers at each stage before tightening.
FAQ
DNS & Mail Authentication questions we are asked
- Will enforcing DMARC break our mail?
- Not when it is staged. Policy starts at p=none, aggregate reports are reviewed for a full billing and campaign cycle, unauthorised senders are fixed, and only then does enforcement move to quarantine and reject.
- Is SPF on its own enough?
- No. SPF breaks on forwarding and only checks the envelope sender. DKIM signing with aligned DMARC is what actually makes a domain hard to spoof.
- How many DNS lookups can SPF have?
- Ten. Exceeding it makes the record permerror and effectively unauthenticated, so includes are flattened or consolidated when a domain gets close.
- Can you get our domain off a blacklist?
- Delisting is requested once the cause — a compromised account, an open relay, misconfiguration or an unauthorised sender — has been identified and closed. Delisting before the fix simply repeats.
Related
Other backup & email platforms
DNS & Mail Authentication is referenced to describe engineering capability. All trademarks and product names are the property of their respective owners; no partnership or endorsement is implied.
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