“DNS Doctor” — Fix Email Deliverability at the Source

The symptoms: how DNS problems show up in real life

DNS issues are sneaky. They don’t always “break email” in a dramatic way. They usually break it quietly:

• Customers say they emailed you… but you never got it
• Your invoices land in spam, especially to Gmail/Microsoft recipients
• Mail works for some senders but not others
• You migrated to Microsoft 365 or Google Workspace and things went weird
• Marketing emails get blocked after you switched platforms
• You see scary terms like “SPF PermError” or “DMARC fail” in reports

If any of that sounds familiar, your DNS is probably telling the truth: something’s off.

What the DNS Doctor service covers

We focus on the records that matter most for email reliability and trust:

MX records (Mail Exchanger)
These tell the world where to deliver your incoming email. Wrong MX = mail goes nowhere (or somewhere you don’t control).

SPF (Sender Policy Framework)
This is your domain’s “approved sender list.” If it’s missing or inaccurate, your messages get flagged as suspicious.

DKIM (DomainKeys Identified Mail)
DKIM adds a cryptographic signature to outgoing mail. Without it, many modern mail systems treat your messages like unverified strangers.

DMARC (Domain-based Message Authentication, Reporting & Conformance)
DMARC ties SPF + DKIM together and tells recipients what to do when something fails. It also generates reports that reveal spoofing attempts and misconfigurations.

Optional: DMARC monitoring
DMARC reports are incredibly useful—and incredibly unreadable without tooling. We can set up monitoring so you can actually use the data.

Why this matters more now than ever

Email providers keep tightening the rules. They’re doing it because spam and spoofing are relentless. The result: domains without proper authentication increasingly lose inbox placement—even if you’re a totally legitimate business.

Think of SPF/DKIM/DMARC like the “seatbelt + airbags + inspection sticker” of email. You can technically drive without them… until you can’t.

What you get from Command Computing

Here’s what a typical DNS Doctor engagement delivers:

• A quick audit of current DNS (and what it’s doing right/wrong)
• Corrections to email-critical records (MX/SPF/DKIM/DMARC)
• Cleanup of old/duplicate records from past services
• Validation tests (so we don’t “hope it works”—we confirm it)
• Clear documentation of what was changed and why
• Optional ongoing DMARC monitoring and tuning

No drama. No jargon soup. Just working email.

The biggest “gotchas” we fix (constantly)

A few classics we see all the time:

• Two SPF records (that’s invalid—SPF must be a single record)
• SPF includes that exceed lookup limits (causing SPF to fail)
• DKIM keys published under the wrong selector
• DMARC set to “none” forever (no protection), or set too strict too fast (mail gets rejected)
• MX records left over from a previous provider (split delivery = missing mail)
• Domain registrar DNS vs. hosting DNS conflicts (changes applied in the wrong place)

These are solvable problems. They just require careful handling—because DNS is one of those “one character wrong” systems.