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Knowledge Base & Operational DocumentationDomains, DNS & Business Email
How to Plan a DNS Change When Some Customers Use Cached Records
A DNS update reaches resolvers at different times, so clients can continue using old addresses after the authoritative record changes. Checks to make Check current TTL well before the change, lower it in advance where appropriate, verify both old and new endpoints during transition, and keep the old service available through the cache window. Restore...
Why Does a Domain Work on One Network but Not Another?
Resolvers may hold different cached answers, or split DNS, IPv6, VPN routing, and local filtering may send users to different endpoints. Checks to make Compare authoritative records with answers from affected networks, including A, AAAA, and CNAME. Check TTL and resolver cache, VPN state, local hosts entries, and certificate coverage. Avoid repeated...
How to Fix Email Delivery When SPF Passes but Messages Still Go to Spam
SPF authenticates an allowed sending path but does not alone establish alignment, reputation, or message quality. Checks to make Check DKIM and DMARC alignment, bounce data, visible From domain, and recent sending changes. Avoid broad SPF includes as a guess. When to get help Email support can review authentication and delivery evidence. Informatix...
How to Check Whether an SPF Include Creates a DNS Lookup Loop
An SPF policy can fail when an included domain points back to the original policy, creates a loop, or adds too many nested DNS lookups. A visible SPF record may look simple while its included services expand into a complex chain. Trace the include chain List each include, redirect, and nested mechanism. Confirm that every service is still used and that...
How to Investigate DNSSEC Validation Failures After a DNS Provider Change
After changing DNS providers, some users may receive resolution failures while others see the site normally. A DNSSEC mismatch is one possible cause: the registrar's DS record may refer to keys that are no longer used by the authoritative zone. Check the chain of trust Confirm which nameservers are authoritative, whether the new zone is signed, and...
How to Move DMARC From Monitoring to Enforcement Carefully
A domain may begin with a monitoring-only DMARC policy to learn which systems send mail. Moving directly to quarantine or reject without reviewing reports can block legitimate messages from websites, vendors, or older business systems. Understand the report data Identify known senders, unknown sources, SPF and DKIM results, and alignment with the...
How to Rotate a DKIM Key Without Interrupting Business Email
Rotating a DKIM key can improve key hygiene, but removing the old DNS selector before every sending system switches may cause legitimate mail to fail verification. Organizations may have more than one sender: mailbox services, web applications, marketing tools, and ticketing platforms can each use a different selector. Inventory signing systems List...
How to Fix an SPF Record That Exceeds the DNS Lookup Limit
An SPF record can look syntactically correct and still exceed the DNS lookup limit used during evaluation. This often happens after several email services are added over time, each contributing nested include records. Publishing multiple SPF TXT records for one domain can also produce a permanent error. Inventory authorized senders List the systems...