# Knowledge Base

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

## Cold Email Outreach

**[Best Cold Email Software: Infrastructure for Scaling Outbound](https://folderly.com/blog/best-cold-email-software-scaling-outbound-teams)**  
Scaling outbound teams need cold email software that delivers. It's about deliverability infrastructure, not just sequencing or 'warm-up,' for consistent...

**[Why Scaling SDRs Fails: Deliverability's Hidden Pipeline Cost](https://folderly.com/blog/scaling-sdr-headcount-deliverability-breaks)**  
Scaling your B2B outbound team without robust email deliverability is a recipe for wasted investment. Learn why your SDRs hit a wall when the infrastructure...

**[My Deliverability Is Fine, But Where Are the Replies? (The Missing Piece in Email Outreach)](https://folderly.com/blog/deliverability-vs-replies-email-outreach-guide)**  
Getting perfect deliverability scores but no replies? Learn why inbox placement is just the beginning and discover the proven framework for turning email visibility into actual conversations and revenue.

**[5 Cold Email Mistakes That Make You Look Like a Spammer (2025 Edition](https://folderly.com/blog/top-5-most-common-cold-email-outreach-mistakes)**  
Discover the 5 critical mistakes that are sabotaging your cold email campaigns in 2025. From AI-generated content that triggers spam filters to authentication failures that kill deliverability, learn what's changed in the email landscape and how to avoid the pitfalls that make legitimate senders look like spammers. Essential reading for anyone serious about email outreach success.

**[How to Get Your Mailbox Ready for Cold Outreach](https://folderly.com/blog/prepare-domain-for-cold-email-outreach)**  
Making your first steps in the cold emailing is challenging. But this comprehensive guide will help you make them. You'll learn how to build a sender reputation for a new mailbox and find out many tips that will make your cold outreach effective.

**[Top 9 Powerful Email Outreach Tools for Snagging Leads and Turning Them into Sales](https://folderly.com/blog/email-outreach-tools)**  
Here's the ultimate list of the proven email outreach software. Explore the benefits of each and how to choose the best to acquire new leads and ensure your emails land in the Inbox.

**[How to Handle Email Warm-Up for Cold Outreach](https://folderly.com/blog/email-warm-up)**  
Are you about to start an email campaign? Haven’t you warmed up your email account yet? If you don’t know how to get the most benefit out of warming up your email account and prevent frustrating results associated with poor warm-up, check our new blog post.