# Knowledge Base

Explore deliverability and learn how to fix spam, send email to right folder

## Email Deliverability

### [Expensive List, Costly Team: Don't Let Deliverability Kill Your ROI](https://folderly.com/blog/your-list-is-expensive-your-team-is-expensive-why-let-spam-kill-both)

Deliverability failure silently wastes outbound budget and team capacity. Learn why 'warm-up' is a myth, and how true infrastructure protects your pipeline.

### [How to Stop Emails Going to Spam (Warmup Doesn't Work)](https://folderly.com/blog/how-to-stop-emails-going-to-spam)

Stop losing pipeline to spam. Learn why your emails aren't landing and how to fix root-cause deliverability issues with a strategic, infrastructure-first approach.

### [Best Email Verification Tools for Outbound Teams](https://folderly.com/blog/best-email-verification-tools-outbound-teams)

For B2B outbound leaders: Master email verification to protect sender reputation, boost deliverability, and maximize ROI. Uncover top tools and critical strategies.

### [Outbound Isn't Broken. Your Deliverability Is.](https://folderly.com/blog/outbound-isnt-broken-your-deliverability-is)

Outbound pipeline stalled? It's not your strategy. It's your deliverability. Learn how broken email infrastructure kills pipeline and what sales leaders can do to fix it.

### [Outbound Pipeline Lost to Spam? Fix Your Email Infrastructure](https://folderly.com/blog/pipeline-missing-spam)

Sales leaders: Is your outbound pipeline lost to spam? Uncover the hidden commercial costs of poor deliverability, inflated CAC, and inaccurate data.

### [How to Use the MxToolbox DKIM Record Generator](https://folderly.com/blog/mx-toolbox-dkim-record-generator)

### [How to Do a Gmail Blacklist Check (And Get Off It)](https://folderly.com/blog/gmail-blacklist-check)

Learn how to run a Gmail blacklist check, spot early warning signs, and follow clear steps to get delisted and restore your sender reputation.

### [How Gmail's Gemini AI Changes Email Deliverability in 2026](https://folderly.com/blog/gmail-gemini-ai-email-deliverability-2026)

Gmail's Gemini AI is fundamentally changing email deliverability. Learn how AI summaries affect your metrics and what you need to do differently in 2026.

### [Why Halloween Should Be an Official Holiday for Everyone Who Got Ghosted in the Spam Folder](https://folderly.com/blog/halloween-official-holiday-of-spam-folder)

If you've ever watched your perfectly crafted cold email vanish into spam, you deserve a day off. Here's why Halloween should be an official holiday for email senders everywhere.

### ["Just Send 15 Emails a Day"? Why That Advice Is Killing Your Deliverability](https://folderly.com/blog/why-send-15-emails-kill-your-deliverability)

If you’ve been told to limit your sending volume to 15-30 emails per day, that’s not safety - that’s stagnation. Learn how Folderly grows sender reputation so you can scale safely.

### [Google Postmaster Tools v1 Is Retiring: Here's Everything You Need to Know About the v2 Update](https://folderly.com/blog/google-postmaster-tools-v2-migration-guide-2025)

Google is retiring Postmaster Tools v1 by end of 2025, removing domain and IP reputation dashboards. Learn what's changing in v2 and how to prepare your deliverability monitoring.