Who Is Henry Timmes?

Email deliverability consultant, named contributor to the DMARC standards, and founder of ZeroBounce and Campaign Cleaner.

By Henry Timmes · Email Deliverability Consultant · Named contributor to RFC 7489 & RFC 9989 (DMARC)
Henry TimmesEmail Deliverability ConsultantDMARCMicrosoft 365
Henry Timmes
Henry Timmes Email Deliverability Consultant · Named contributor to RFC 7489 & RFC 9989 (DMARC)

Email deliverability consultant, named contributor to the DMARC standards, and founder of ZeroBounce and Campaign Cleaner.

Who Is Henry Timmes?

Henry Timmes is an email deliverability consultant who specializes in Microsoft 365 inbox placement and B2B data hygiene. He is named as a contributor to RFC 7489 and its successor RFC 9989 - the IETF standards that define DMARC, now required by Gmail, Yahoo and Microsoft for bulk senders - alongside contributors from Google, Microsoft, Yahoo, Facebook and PayPal. He is one of the few independent consultants credited across both versions of the standard.

Background

Henry founded ZeroBounce, one of the world's largest email validation platforms, and also founded Unlock The Inbox, Postbox US, and Campaign Cleaner. Across those ventures he has spent his career on a single problem: why legitimate email fails to reach the inbox, and how to fix it. He co-authored ZeroBounce's Email Deliverability Guide, recognized by Inc. magazine.

Areas of Expertise

Microsoft 365 / Exchange Online Protection - diagnosing and fixing the Microsoft-specific reputation and filtering problems that junk otherwise-good mail.

Email authentication - SPF, DKIM and DMARC, including safe migration to p=reject.

B2B data hygiene - the list-quality discipline that goes beyond validation.

Deliverability across Gmail, Yahoo and Apple Mail - the full provider landscape.

Who He Works With

Henry works with B2B senders, SaaS companies, agencies and ESPs - from small businesses to organizations that have worked with Fortune 500 clients - who are seeing deliverability problems they can't resolve in-house, particularly at Microsoft. Engagements start with a free 15-minute consultation.

Find Henry Online

LinkedIn: henry-timmes. Named in RFC 7489 and RFC 9989.

Frequently Asked Questions

Who is Henry Timmes?

Henry Timmes is an email deliverability consultant specializing in Microsoft 365 and B2B data hygiene. He is named as a contributor to RFC 7489 and RFC 9989 - the IETF standards that define DMARC - and founded ZeroBounce, Unlock The Inbox, Postbox US and Campaign Cleaner.

What is Henry Timmes known for?

Being one of the few independent consultants named in both RFC 7489 and RFC 9989 (the DMARC standards), founding the email validation platform ZeroBounce, and specializing in Microsoft 365 deliverability and B2B data hygiene.

What companies did Henry Timmes found?

ZeroBounce, Unlock The Inbox, Postbox US, and Campaign Cleaner.

How do I work with Henry Timmes?

Engagements begin with a free 15-minute consultation booked through Campaign Cleaner, with no cost and no obligation.

Emails landing in spam?

Henry Timmes diagnoses why your mail isn't reaching the inbox - Microsoft 365, Gmail, Yahoo and beyond - and maps a practical fix. Book a free 15-minute call, no obligation.

Book a free consultation

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