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Knowledge Base & Operational DocumentationDomains, DNS & Business Email
Why Does Email Authentication Pass for One Sender but Fail for Another?
Different sending services may use different return paths, signing domains, or sending IPs. A domain-level SPF or DMARC result can therefore vary by message source. What to check Compare authentication results and headers for each sending service. Check SPF alignment, DKIM signing domain, DMARC policy, and any third-party platform configuration....
Why Does a DNS Change Appear on Some Devices but Not Others?
Different devices and networks can cache DNS answers for different periods or use different resolvers. A partial rollout does not necessarily mean the authoritative records are inconsistent. What to check Query the authoritative nameservers and compare resolver answers, TTLs, local caches, and IPv4 versus IPv6 records. Confirm the hostname and record...
Why Does a Newly Created Mailbox Fail to Authenticate in an Email App?
A new mailbox can exist while the email app uses an outdated server name, port, security mode, or username format. Some providers also require a separate app password or modern authentication. What to check Confirm mailbox status, published client settings, username format, TLS requirements, and whether the account is subject to MFA or access...
How to Troubleshoot a Domain That Works Without HTTPS but Fails With HTTPS
A site may answer on HTTP while HTTPS fails because the certificate is missing, expired, assigned to another hostname, or blocked by a redirect or TLS configuration. What to check Check certificate names and validity, SNI, server binding, intermediate chain, redirect rules, and DNS for each hostname. Test from more than one network. Recommended next...
Why Does a Website Load With a Trailing Slash but Fail Without It?
A path that behaves differently with and without a trailing slash can point to rewrite rules, relative links, routing configuration, or canonical URL handling. What to check Compare status codes and redirect chains for both forms. Inspect application routes, base URL settings, rewrite rules, and relative asset links. Recommended next step Choose a...
Why Does a Domain Verification Record Fail Even Though It Is in DNS?
A verification service may not find a record if it is published under the wrong hostname, record type, or DNS provider, or if the service checks a cached answer. What to check Compare the requested name and value exactly, query authoritative nameservers, check CNAME versus TXT requirements, and verify delegation and TTL. Recommended next step Correct...
Why Does a Domain Verification Service See an Old Nameserver?
A registrar update may not have reached the registry, or cached delegation data may still point to a previous DNS provider. Records edited at the new provider will not be visible until delegation is correct. What to check Check registrar nameserver settings, registry delegation, authoritative responses, and DNSSEC configuration. Compare results from...
Why Does a Mail Server Reject Messages From a Newly Added Sending Service?
A new email service may not be authorized in domain authentication records or may use a different sending identity than expected. Rejection can protect recipients from spoofed mail. What to check Review the SMTP rejection, sending domain, envelope sender, SPF and DKIM alignment, DMARC policy, and vendor setup guidance. Confirm DNS changes at...