Transactional
Cold email & newsletter
Tools
See your emails land in the inbox, not spam
Free deliverability monitoring on every plan
Node.js 
Python 
PHP 
C# Warm-up built on real conversations.
Our network of real inboxes opens your emails, pulls them out of spam, marks them read, and replies — keeping a genuine back-and-forth thread that trains inbox providers to trust you as a good sender.
7-day free trial · No credit card required
Hey! Just following up on the proposal we discussed last week — any thoughts?
Yes, sorry for the delay — looks good on our end, let's set up a call this Thursday.
Perfect, Thursday works. I'll send a calendar invite shortly.
A real thread, not a bot ping
Providers watch
what happens next.
Every message is opened, read, replied to, and kept in a full conversation history — just like two real people emailing back and forth.
Inbox providers don't just look at whether a message landed — they look at what happens after. Sendcorex Warm-up opens the email, removes it from spam if it lands there, marks it as read, replies to keep the thread alive, and occasionally marks it important or stars it. That pattern of engagement is exactly what builds sender reputation over time.
Opened
Every message gets opened and marked as read.
Rescued
Pulled out of spam the moment it lands there.
Replied
A real reply keeps the thread alive.
Starred
Sometimes marked important, like real recipients do.
Works with any provider — no DNS changes
Gmail 
Google Workspace 
Outlook / Hotmail 
Yahoo AOL 
Mail.ru 
Yandex How it works
One connection.
A full conversation.
Connect your sending account and let the network do the rest — no DNS records, no MX changes, no technical setup.
Connect your inbox
Log in with your existing email account — Gmail, Outlook, or any provider. No DNS, no MX record changes.
Real inboxes reach out
Other real accounts in the network send you 100 to 200+ messages a day, spread out naturally over time.
We open & rescue from spam
Every message is opened, pulled out of the spam folder if it lands there, and marked as read.
We reply, keeping the thread
A real reply goes back, building a full back-and-forth history in the same thread — not a one-off ping.
Important & starred, sometimes
A portion of the conversation is marked important or starred, mirroring how real recipients actually behave.
Reputation builds, day by day
Providers see consistent, positive engagement and gradually trust your domain and IP as a good sender.
How we compare
Same idea.
Simpler pricing.
Most warm-up tools charge a recurring monthly fee, per inbox, forever. Sendcorex Warm-up is a fixed-length campaign — pay once for the duration you need.
| Sendcorex Warm-up | Typical warm-up tool | |
|---|---|---|
| Pricing model | One-time, per campaign length | Recurring, per inbox / month |
| Messages per day | 100–200+ | 75–1,000, tiered by plan |
| Free trial | 7 days | 7 days |
| DNS / MX changes | None required | Varies by provider |
| Provider coverage | Gmail, Workspace, Outlook/Hotmail, Yahoo, AOL, Mail.ru, Yandex | Varies by provider |
| Entry price | From €2.99 total for 7 days | From ~$15/mo per inbox |
Comparison based on publicly available pricing pages, 2026.
Pricing
Pick your
campaign length.
Basic
Save 8%€2.99
7 days · total campaign
100–200+ msgs/day
Testing
Standard
Save 63%€5.99
15 days · total campaign
100–200+ msgs/day
Short campaigns
Pro
PopularSave 66%€10.99
30 days · total campaign
100–200+ msgs/day
Most users
Advanced
Save 67%€15.99
45 days · total campaign
100–200+ msgs/day
Growing audience
Pro Plus
Save 68%€19.99
60 days · total campaign
100–200+ msgs/day
Scaling campaigns
Business
Save 69%€28.99
90 days · total campaign
100–200+ msgs/day
Agencies
Enterprise
Save 74%€36.99
120 days · total campaign
100–200+ msgs/day
High volume
Annual
€89.99
1 year · total campaign
100–200+ msgs/day
Long-term value
All plans include 100–200+ warm-up messages/day, full thread history, spam-folder recovery, and support for every major provider. No DNS changes required.
Stop landing in spam.
7-day free trial · No credit card required.