Formula Inbox

Emails going to spam? Get a free diagnostic.

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A Staffing Firm's Microsoft Email Went From 100% Spam to 100% Inbox in Seven Days

What clients say

Jacob E.

CEO, B2B SaaS · via Upwork

Formula Inbox is clearly a master of cold email deliverability! Highly recommend.

Jennifer J.

Director of Marketing, B2B SaaS · via Upwork

Formula Inbox was exactly what I needed for a messy deliverability situation. They audited our email content, diagnosed what was actually causing the issue, and handed me a clear action plan I could take to my team. What I appreciated most was that they communicated everything in plain language without making me feel like I needed a computer science degree to follow along. Fast, thorough, and easy to work with. Would hire again without hesitation.

Jeff T.

VP of Sales, Professional Services · via Upwork

Formula Inbox is terrific. We experienced a significant decline in our email response rate and spent weeks trying to figure it out. I did a one-hour consultation with Formula Inbox. They ran a series of tests and identified the problem and recommended several steps we need to take to correct it.

Alex J.

VP of Sales, B2B SaaS · via Upwork

Formula Inbox was a true subject matter expert on email deliverability, and immediately assessed our work and provided recommendations going forward.

Jonathan P.

Founder, Marketing Agency · via Upwork

Formula Inbox launched an email list with tens of thousands of subscribers that we had let go cold and hit an incredible 50%+ open rates. Their depth of knowledge on strategy and deliverability was the difference maker. Kind, sharp, and genuinely cared. Looking forward to working with them again.

Joe F.

CEO, Recruiting Agency · via Upwork

Amazing - especially if you have MS Outlook!

Eva R.

VP of Operations, Marketing Agency · via Upwork

Amazing consultation! Very knowledgeable. On a completely different level than other deliverability conversations we've had. If you need somebody for SERIOUS deliverability and email infrastructure you're in good hands.

Matt B.

Owner, Independent Book Publisher · via Upwork

Formula Inbox was very helpful in helping me understand and unravel a list bomb attack and a whole set of deliverability issues. I plan to work with them again if I have any future issues.

Travis W.

VP of Marketing, Healthcare · via Upwork

Very knowledgeable. We'll be hiring Formula Inbox to resolve our email deliverability issues.

Joe E.

Founder, E-Commerce Agency · via Upwork

Formula Inbox is amazing. Really helped us solve a key deliverability problem. Thanks again!

Kirk S.

Owner, Government Contractor · via Upwork

Formula Inbox did a great job! Very happy with their service.

Alyson R.

COO, PR Agency · via Upwork

Formula Inbox was very quick to address our concerns and resolved everything in a timely manner.

Quintin G.

CEO, B2C SaaS · via Upwork

Formula Inbox was exactly what we needed. They understood the project, planned and drove it to completion, and took the initiative every week to keep us on track. Could not have asked for a better experience.

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What the diagnostic covers

  • Where your email lands.

    We send test emails from your domain to major email providers and show you how many reach the inbox or spam.

  • Your DNS records, checked.

    We review your SPF, DKIM, and DMARC records, the settings that prove your email really comes from you, and look for errors or gaps.

  • What is causing the problem.

    If we find problems, we tell you what they are and what is behind them. Fix them yourself or talk to us about help.

Find out where your email lands and why.

Book my free diagnostic

Questions before you book

An inbox placement test and a DNS review. We send test emails from your domain to see where they land at major providers, and we review your SPF, DKIM, and DMARC records for errors or gaps.

The diagnostic is free with no obligation. If we find problems, we will tell you what they are, and you are free to fix them yourself or talk to us about help.

The diagnostic will be completed in 30 minutes, on the call.

You will need to access the email service provider (ie: HubSpot, Instantly, Mailchimp, Google Workspace) that you want tested.

Findings are delivered on the call, with a brief follow-up report following.

Yes. Formula Inbox is platform-agnostic and works with cold outbound, marketing, and transactional email programs.

SaaS, Professional Services, e-commerce, agencies or any business whose emails are landing in spam, or that are starting email for the first time and want the fundamentals right.

No. Results depend on factors outside any consultant's control, such as list quality, recipient engagement, and provider policy changes. We find and fix the root causes of your problem. Ongoing monitoring is available as a separate service.

Book my free diagnostic