15x Weekly Signup Growth

TL;DR

A U.S. based legal education and travel company had a severely damaged email program — campaigns were blasted to hundreds of thousands of contacts with no domain warm-up, broken authentication, and copy that consistently landed in spam. INSIDEA rebuilt the entire infrastructure from the ground up: retiring the compromised primary domain, setting up alias domains with full SPF, DKIM, and DMARC authentication, and replacing one-shot blasts with structured cold and warm email sequences. Over 51 weeks, open rates climbed from under 18% to 28-35%, click rates rose from below 1% to as high as 10.5%, and weekly event signups increased more than 15x, without increasing advertising spend.

Measurable Results

Over 51 weeks, INSIDEA transformed a broken outbound email program into a reliable acquisition engine. The primary domain was retired, alias domains were set up with full SPF, DKIM, and DMARC authentication, and structured warm-up sequences were run before any campaigns went live. Cold and warm outreach were separated into dedicated workflows – each with its own tooling, copy strategy, and success metrics; ensuring no lead was handled with a one-size-fits-all approach.

The results compounded steadily from Q1 through Q4. Open rates climbed from under 18% to as high as 29.40%, click rates grew from below 1% to 7.30% by Q4, and qualified replies went from zero to 25 or more per month. Weekly event signups increased more than 15x – and paid registrations continued to grow without a single dollar of additional advertising spend.

Who Can Benefit

The email infrastructure and strategy INSIDEA deployed here is directly applicable to any organization that relies on outbound email to generate leads, registrations, or sales conversations — and is not getting the results their list size should produce. If any of the following describe your situation, this approach is built for you.

Frequently Asked Questions

Why do emails land in spam even when sent to a large, existing list?

High-volume sending to large contact lists without domain warm-up is one of the most common causes of deliverability failure. Email providers assess sender reputation based on engagement signals and authentication records. When a domain sends at high volume without a proper warm-up period and without SPF, DKIM, and DMARC correctly configured, spam filters treat outbound mail as suspicious, regardless of list size. Rebuilding from a properly authenticated alias domain with a structured warm-up sequence is the correct fix.

What is domain warm-up and why does it matter for cold email?

Domain warm-up is the process of gradually increasing sending volume from a new domain over several weeks so that email providers recognize it as a legitimate, trustworthy sender.

What is the difference between cold email outreach and warm email nurturing?

Cold email targets contacts who have not previously engaged with your brand, with the goal of generating an initial reply or expression of interest. Warm email nurturing is designed for contacts who have already shown some level of engagement – an open, a click, a form submission and moves them progressively toward a conversion. Treating these two audiences with the same campaigns, tools, and copy is a common mistake that undermines both programs. They require different platforms, different messaging approaches, and different success metrics.

How long does it take to rebuild email deliverability after it has been damaged?

Recovery timelines depend on how severely the primary domain's reputation has been affected. In cases where the primary domain is beyond repair, retiring it from outbound use and rebuilding on properly authenticated alias domains is often faster than attempting rehabilitation. In this engagement, meaningful open and click rate improvements were visible within the first quarter, with the program reaching full performance by week 30 of a 51-week engagement.