You can write the sharpest cold email ever, but if your domain reputation is weak, your prospects never see it.
That’s why email warm-up isn’t a “nice to have” anymore. It’s the baseline for making sure your outreach lands in real inboxes, not spam folders nobody checks.
Mailwarm has been a go-to quick fix for this for years. Plug it in, set your volume, and it does what it says: basic warm-up to help build trust.
But here’s what smart senders, agencies, and SaaS teams keep learning: warm-up done right is what actually keeps you out of spam. And that means going beyond the bare minimum. No stale warmup networks, no hidden fees, no missing checks.
That’s exactly where Mailivery comes in. It’s the warm-up and deliverability toolkit that Mailwarm leaves out.
Every warm-up tool sells the same promise: “We’ll make your domain look trustworthy so mailbox providers like Gmail and Outlook don’t shove your emails into spam.”
But trust doesn’t come from volume alone.
Mailbox providers judge reputation based on engagement:
Mailwarm can automate some of this – opening, replying, moving messages out of spam folders. But if your warm-up network is stale, filled with low-quality inboxes, or run in ways that raise red flags (like AI browser bots), you’re actually training Gmail to see you as suspicious, not safe.
Look at Mailwarm’s pricing and features:
It’s simple. One inbox, $79/month. Need five inboxes? Pay five times. That’s $395/month just to keep five senders warm.
Need 20 inboxes? That’s almost $1,600/month.
And what are you actually buying?
Just the warm-up cycle: automated sends and replies. No extra deliverability checks. No spam word scanner. No blacklist monitor. No robust API if you want to integrate warm-up natively in your own product.
Oh and then there’s something else: McAfee’s WebAdvisor flags Mailwarm.com as suspicious. That doesn’t mean the website is dangerous, but when your entire goal is trust and reputation, that’s a red flag that’s hard to ignore.
With Mailivery, your inbox joins a real, monitored warmup network. It sends, receives, replies, and rescues messages from the spam folder. But that’s just step one.
What you get next is the piece that fixes what Mailwarm misses.
With Mailwarm, your cost multiplies every time you add an inbox.
Mailivery flips this: you pay for your daily warm-up volume, not how many inboxes you connect.
Want to warm up 2 inboxes? 10? 50? Same predictable plan.
For agencies and SaaS teams managing multiple domains, this is non-negotiable. Scale your outreach without scaling your costs out of control.
Warm-up alone isn’t enough.
That’s why Mailivery bakes in:
These aren’t premium add-ons. They’re standard. Because deliverability depends on more than engagement volume – it depends on sending to valid addresses with trustworthy content, every time.
Mailwarm’s simplicity means it also locks you into one flavor of warm-up. You can’t tweak ramp-up speeds or deeply customize your warm-up templates without workarounds.
Mailivery is built for control.
The full toolbox is there from day one. No hidden gates or forced upsells.
A warm-up network is only as strong as its quality. Mailivery’s is actively monitored, diversified, and refreshed. Every mailbox is verified and configured to replicate real sender-recipient behavior.
There are no fake throwaway inboxes. No idle mailboxes just inflating stats. No AI agents doing browser-based gymnastics that major providers can detect and penalize.
Just real inboxes, real IMAP and SMTP actions. Exactly how trusted warm-up should look.
Ask any agency running high-volume cold email: support matters. When deliverability tanks, you can’t wait days for outsourced support.
Mailivery’s team stays in the loop. Need an edge-case fix? You’re talking to the builders – not a ticket machine. Many of Mailivery’s best features came straight from agency feedback:
You’re not a passive user. You’re part of the roadmap.
If you’re building a SaaS or platform that wants warm-up built-in, Mailwarm doesn’t help you.
Mailivery does.
Its API lets you:
And because it’s flexible, you’re not boxed into cookie-cutter settings.
Peek at G2, Capterra, or Product Hunt and you’ll see the same theme:
Mailwarm users like the simplicity, but they wish it did more.
Mailivery’s reviews highlight the extra tools, the responsive team, and the fact that deliverability actually improves, not just the numbers.
What do you like best about Mailivery?
They use unique and real email text, not just random lorem ipsum text like others…They have a proprietary technology that moves the emails automatically.
— G2 user review
Mailwarm does its job for the solo founder or small sender who only needs to warm up one or two inboxes and has no plans to scale. For some, that’s enough.
But if you’re serious about cold outreach, if you run client campaigns, manage multiple domains, or you simply don’t want to gamble your domain’s trust score on bare-bones warm-up, Mailivery covers the blind spots.
It’s warm-up done right:
You’re not paying for “warm-up theory.” You’re buying trust signals that stand up to how Gmail and Outlook actually work.
If you’ve outgrown Mailwarm, or you’re not willing to risk the gaps, check out Mailivery before your next campaign:
Protect your domain. Keep your cold emails in the inbox, where they belong.
The easiest way to get responses to your cold emails.
