You’ve already done what most people don’t.
Your subject lines are personal. Your copy is clear. Your CTA makes sense.
But your reply rate? Still flat.
The likely issue isn’t what you’re saying. It’s whether anyone’s even receiving it.
This is the part of cold outreach that often gets missed: deliverability. If Gmail, Outlook, or Yahoo don’t trust your domain, your emails never make it into the inbox. Doesn’t matter how strong your message is. No one sees it.
That’s probably why you’re here. Folderly looked like it could solve that. Maybe it helped, perhaps it didn't.
Now you’re looking for something better.
In this guide, you’ll find nine Folderly alternatives. Some tools are lightweight, some go deeper. A few are worth considering long term. One stands out if you’re serious about scaling cold email without deliverability headaches.
No gimmicks. No copy hacks. Just a look at what actually builds the kind of sender reputation inbox providers trust.
Most senders track the wrong things.
Open rate. Click rate. Reply rate.
All good metrics. But none of them matter if your emails aren’t getting delivered.
Mailbox providers evaluate three core signals:
If those boxes aren’t checked, the message doesn’t land. It gets filtered, flagged, or ignored.
That’s why warm-up isn’t about sending more. It’s about proving credibility through consistent, measurable behavior.
Mailivery focuses on building trust through engagement. It uses a peer-to-peer network of more than 30,000 real inboxes to replicate the behaviors mailbox providers use to evaluate senders.
Includes a 7-day trial, full access to blacklist checks, and unlimited mailboxes.
Company: Harness
Problem: High sending volume triggered Gmail blocks
Solution: Implemented Mailivery across domains
Result:
"Mailivery saved us from spam. We send hundreds of cold emails per day and haven’t been blocked by Google once since using it."
— Andrew Scarborough, Co-Founder, Harness
lemwarm is lemlist’s email warm-up tool. It helps build sender reputation through a warm-up network of 20,000+ inboxes.
An easy option for lemlist users, though pricing increases quickly with more inboxes.
Warmbox automates warm-up through AI-generated emails sent across a 35,000+ inbox network. It prioritizes flexibility and diagnostics.
Best for users who want more manual control or agency dashboards.
Warmup Inbox connects to your ESP or SMTP provider and performs basic engagement actions across verified inboxes.
Useful for small teams or solo operators looking for something simple.
Warmy.io uses an AI assistant to optimize warm-up activity in response to real-time deliverability performance.
Best for users who want to set it once and let the tool self-adjust.
InboxAlly is built for scale. It gives users control over warm-up behavior patterns and offers detailed ISP-level reporting.
A good fit for agencies or large teams managing deliverability across multiple clients.
Allegrow measures how your actual recipients interact with your emails, not test inboxes. It blends placement analytics with domain monitoring.
Geared toward B2B teams validating placement on real lists.
TrulyInbox is a peer-based warm-up platform with basic sender reputation features.
A simple option if you need foundational warm-up support.
This tool is integrated with Mailshake and automates warm-up inside active campaigns.
Seems like a somewhat abandoned product.
Deliverability is about trust.
It comes from consistent engagement, technical compliance, and predictable sending behavior. Without that foundation, even the best outreach fails to reach your audience.
The tools in this list take different routes to solving that problem. Some focus on automation. Others provide detailed analytics or simulate human interaction. A few combine all of the above.
But no matter which path you take, the principle stays the same: reputation is built over time through real signals.
Mailivery adapts to algorithm changes, responds to inbox signals, and maintains trust as your sending scales. It doesn’t just warm up a domain. It helps keep it healthy.
Here’s what sets it apart:
The result is a platform that supports outbound at scale without constant babysitting.
You can try Mailivery for free for 7 days.
No single solution fits everyone.
Whatever you choose, prioritize what gets you seen and keeps you trusted. Because great messaging only works if it actually gets delivered.
The easiest way to get responses to your cold emails.
