Pearl Lemon

SEO, Lead Generation & Growth Agency

Learn how lead gen agency Pearl Lemon increased inbox placement by 30%, stabilized reply rates, achieved revenue stability, and ensured clean cold outreach campaign launches for clients with GlockApps.

Founded 2016

London, UK

B2B

Introduction

Pearl Lemon is an SEO, lead generation, and growth agency working with clients across multiple countries and industries. The agency supports businesses through outbound campaigns, organic search, and deliverability-focused growth systems designed to keep lead generation predictable and scalable.

A significant part of Pearl Lemon’s work involves cold email, sales outreach, PR campaigns, and multi-channel lead generation. This requires careful management of email infrastructure, domain reputation, authentication, and inbox placement, especially when running high-volume outreach across multiple domains and email service providers.

Pearl Lemon Improved Inbox Placement from ~55% to 85%+ with GlockApps

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results in numbers

Continuous deliverability monitoring and early alerting with GlockApps helped Pearl Lemon turn unstable performance into predictable inbox placement.

CHALLENGE

Maintaining Inbox Placement Across High-Volume, Multi-Domain Outreach

In their work, Pearl Lemon regularly addresses complex deliverability challenges, including domain reputation issues, inbox placement problems, and high-volume outreach that must scale without compromising performance.

The main company’s goals included:

Boosting lead generation and conversions;
Maximizing ROI;
Strengthening brand awareness;
Improving communication with clients and prospects;
Optimizing sales and marketing campaigns.

In their cold outreach practice, the agency faced common but impactful challenges:
Email deliverability issues;
Low open rates;
High spam rate;
Concerns about sender reputation;
Lack of insights into email performance;
Difficulty reaching recipients’ inboxes.

For a company running multiple domains, ESPs, and high-volume outbound campaigns, deliverability issues can quickly impact pipeline performance, client campaigns, and revenue stability.

SOLUTION

Proactive Deliverability and Authentication Monitoring with GlockApps

To address these challenges, Pearl Lemon implemented GlockApps’ Inbox Insight, DMARC Analyzer, and Uptime Monitor into its workflow.

The team chose GlockApps based on the following criteria:

Accuracy;
Comprehensive reporting;
Customizable parameters;
Multi-client support;
Scalability;
Cost-effectiveness.

Implementation Process

Pearl Lemon’s team noted that the GlockApps implementation was extremely straightforward. They were able to start running inbox placement tests and domain health checks almost immediately. Because they manage multiple domains and high-volume outreach, the simplicity of setup was a big advantage.

Results

From Reactive Fixes to Consistent Inbox Performance

Proactive deliverability management with GlockApps gave the team the ability to identify issues early and act before campaigns began to falter. The team gained clearer insights into domain reputation, faster warm-up cycles for new domains, and far fewer unexplained drops in outreach performance.

Across sales, PR, and lead generation campaigns, emails began landing consistently where they were intended. This stabilized reply rates and improved overall pipeline reliability as sending volume scaled across multiple teams.

The company uses the following sender setup:

Sending infrastructure runs on shared IPs with domain-level authentication (SPF, DKIM, DMARC) configured per domain;
They operate multiple domains across teams, typically sending between 200–1,000 emails per day across cold outreach, sales follow-ups, PR outreach, and client campaigns;
Volume varies by domain health and warm-up stage, and the agency frequently spins up new domains for client-specific outbound flows or segmentation.

Key wins:
Improved inbox placement from ~55% to 85%+ after resolving issues surfaced by GlockApps;
30–40% reduction in warm-up time when launching new domains;
More stable reply rates, even as they scaled sending volume across multiple teams;
Dramatically fewer “mystery” performance drops due to continuous monitoring and early alerting.

Advice to other businesses: “If email is a core part of your acquisition or communication strategy, don’t wait for deliverability issues to show up in your KPIs. Use GlockApps early. It’s one of the few tools that gives you clarity across multiple domains, reps, and campaign types. For any company running high-volume outbound or juggling several ESPs and domains, it’s the easiest way to catch problems fast before they derail pipeline or client campaigns.”

GlockApps has become a quiet backbone of our outbound and SEO-led growth engine. By catching issues early and keeping our deliverability consistent, it’s helped protect our pipeline, preserve revenue stability, and ensure client campaigns launch cleanly. For an agency like ours, that clarity is invaluable.