CampaignKit Blog

Expert insights on email deliverability, validation, and marketing automation

75 articles•Page 1 of 7

Featuredemail validation

The Best MillionVerifier Alternative in 2026

MillionVerifier is a fast, genuinely cheap bulk email verifier — but catch-all handling, support response times and a 10,000-credit minimum send plenty of users looking for something else. Here is an honest comparison of CampaignKit and MillionVerifier, including the cases where MillionVerifier is still the right call.

September 20, 2026•13 min read

email validation

Real-Time Email Validation at the Point of Capture

Learn how to integrate real-time email validation into signup forms, checkout pages, and registration flows to prevent bad data from entering your system.

Apr 15, 2026

11 min read

deliverability

How to Set Up an Email Deliverability Monitoring Stack

Build a deliverability monitoring stack using Google Postmaster Tools, Microsoft SNDS, seed testing, and blocklist alerts to catch problems early.

Apr 2, 2026

12 min read

spam traps

Spam Traps Explained: Types, Detection, and Prevention

Understand the four types of spam traps, how they infiltrate your list, how to detect exposure, and the operational practices that keep you off blocklists.

Mar 31, 2026

12 min read

bounce management

Understanding SMTP Bounce Codes: What They Mean and How to Respond

A practical guide to interpreting SMTP bounce response codes, distinguishing hard from soft bounces, and building an operational response framework.

Mar 29, 2026

13 min read

deliverability

How to Build an Email Sunset Policy That Protects Deliverability

Learn how to design and implement a sunset policy that removes inactive subscribers systematically, protecting sender reputation and inbox placement.

Mar 27, 2026

11 min read

deliverability

BIMI for Email Marketers: Display Your Brand Logo in the Inbox

Learn how to implement BIMI to show your verified brand logo next to emails in the inbox, from DNS setup to VMC certificates and common mistakes.

Mar 25, 2026

11 min read

deliverability

Email Warmup Guide: How to Build Domain Reputation From Scratch

Learn how to warm up a new email domain from scratch with a week-by-week schedule covering DNS setup, domain aging, volume ramping, and reputation monitoring.

Mar 23, 2026

12 min read

sender reputation

How to Recover Sender Reputation After a Deliverability Crisis

A step-by-step recovery framework for diagnosing root causes, cleaning your list, and rebuilding sender reputation after a deliverability crisis.

Mar 23, 2026

11 min read

email validation

What Are Catch-All Emails and Should You Send to Them?

Catch-all email domains accept messages sent to any address, whether the mailbox exists or not. This makes them impossible to fully verify — and a grey zone for email marketers. Learn what catch-all emails are, why they matter, and how to handle them safely without destroying your sender reputation.

Mar 23, 2026

11 min read

email validation

Automate Your Email Validation Workflow with Zapier and CampaignKit

Automating email validation offers significant benefits, including improved efficiency, enhanced deliverability, and robust regulatory compliance. By integrating tools like Zapier and CampaignKit, email marketers can maintain high-quality lists, optimize marketing operations, and ensure their messages reach the intended audience effectively. Embrace automation to stay ahead in the dynamic world of email marketing.

Nov 26, 2025

5 min read

Achieving GDPR-Compliant Email Campaigns in Europe: A Comprehensive Guide

1. Introduction The General Data Protection Regulation (GDPR) has fundamentally reshaped email marketing operations within Europe. As a robust data protection framework, GDPR prioritizes user privacy and mandates stringent practices for managing personal data. Email marketers face the dual challenge of adhering to these regulatory requirements while maintaining effective marketing operations. Non-compliance with GDPR can lead to significant fines and damage to brand reputation. Beyond le

Oct 11, 2025

5 min read