01
Paying Hidden Fees Everywhere
Competitors charge $4 for a mailbox, but hit you with extra domain charges and force you to pay $99/mo for a separate sequencing platform.
Pre-Warmed Mailboxes + Intent-Based Outreach
Cold Email Outreach in Under 1 Day. Zero Domains to Buy. Zero Spam Risk.
Stop buying domains, wrestling with DNS setup, and waiting 4 weeks for warmup. Get pre-warmed mailboxes with 100% free domains included, powered by an AI engine that writes unique, intent-based emails that land straight in the primary inbox.
- Zero domain fees forever
- No credit card required
- Ready to send in 60 seconds
Inbox · Primary
1 of 5
Scaling outbound email at YourCompany
Cold outreach
Primary
S
Shubham <[email protected]>9:02 AM
Saw YourCompany is ramping outbound. Most teams take 6-8 weeks to add...
Hi Sarah,
Saw YourCompany is ramping up outbound this quarter. Most teams take 6-8 weeks to add new sending capacity: domains, mailboxes, warm-up. Worth 10 minutes on how to skip that?
Best,
Shubham
Sbl.so
SM
Sarah Mitchell <[email protected]>11:24 AM
How's deliverability if we skip the warm-up period?
Hi Shubham,
Interesting. How's deliverability if we skip the warm-up period? That's usually the whole point of waiting.
Sarah
Head of Growth, YourCompany
S
Shubham <[email protected]>11:31 AM
Mailboxes come pre-warmed already, real send history...
Hi Sarah,
Mailboxes come pre-warmed already: real send history, real replies, not a synthetic warm-up loop. That's why we can guarantee 95%+ primary inbox placement from day one.
Best,
Shubham
Sbl.so
SM
Sarah Mitchell <[email protected]>2:08 PM
That answers it. Send me a link and I'll take a look...
Hi Shubham,
That answers it. Send me a link and I'll take a look with the team.
Sarah
Head of Growth, YourCompany
S
Shubham <[email protected]>2:09 PM
Here you go, pick any slot that works...
Hi Sarah,
Here you go, pick any slot that works: sbl.so/sarah
Best,
Shubham
Sbl.so
Sbl.so is sending the first email
95% primary inbox
Trusted by 5,000+ sales teams who sent 50M+ emails
C
Cialdini Institute
Cialdini Institute
T
Topmate
Topmate
P
Periskope
Periskope
C
Clinikk
Clinikk
J
JNN Group
JNN Group
U
Unita Capital
Unita Capital
W
Winny Immigration
Winny Immigration
K
KloudBean
KloudBean
L
Lectrix
Lectrix
G
Growth School
Growth School
E
Emoha Elder Care
Emoha Elder Care
D
DataWars
DataWars
C
Cialdini Institute
Cialdini Institute
T
Topmate
Topmate
P
Periskope
Periskope
C
Clinikk
Clinikk
J
JNN Group
JNN Group
U
Unita Capital
Unita Capital
W
Winny Immigration
Winny Immigration
K
KloudBean
KloudBean
L
Lectrix
Lectrix
G
Growth School
Growth School
E
Emoha Elder Care
Emoha Elder Care
D
DataWars
DataWars
The problem
Why Cold Email Outreach Breaks Down for Most Teams
To send cold emails today, you are forced to stitch together 4 different tools and waste a month of dead time before sending a single message:
- Buy DomainTool 1
- Buy MailboxTool 2
- Pay for Warmup ToolTool 3
- Wait 4 WeeksDead time
- Buy SequencerTool 4
The usual stack
3 to 4 weeks
Sbl.so
Under 1 day
The 3 Big Mistakes That Get You Flagged as Spam:
02
Sending Static "Template" Spam
Using the same template or simple spintax for 1,000 leads gets your domain blacklisted by Google and Outlook in days.
03
Outreach Without Buying Signals
Emailing cold lists without a reason to reach out leads to zero replies and high spam reports.
Get pre-warmed Google & Outlook mailboxes delivered today
Why SBL
Why SBL Gets 3x Higher Conversions & Reply Rates
Other tools just send text blasts. SBL combines live intent signals, dynamic media, and 1-to-1 AI copywriting to make every outreach message impossible to ignore.
YourCompany posted 3 SDR job openings2m ago
Lumen Health raised a $12M Series A18m ago
Fieldcraft switched CRM to HubSpot1h ago
01
Real-Time Intent Signals
Stop pitching cold leads who aren't buying. SBL constantly monitors target accounts for live intent signals—job openings for sales roles, new funding rounds, product launches, or tech stack changes—so your outreach arrives at the exact right moment.
To: Sarah · YourCompanyUnique
Sarah, inboxes for your 3 new SDRs?
To: Dev · Lumen HealthUnique
Congrats on the Series A, Dev
02
1-to-1 AI Personalization (Subject & Body)
Google and Microsoft spam filters easily detect static templates. SBL generates a 100% unique subject line and email body for every single lead based on their specific intent data, giving you a guaranteed 95%+ primary inbox placement.
YOURCOMPANYHey Sarah, made this for your SDR team
Image
For Sarah0:42
Video
Nope
Waiting 4 weeks for warmupYep
Sending before lunch
03
Dynamic AI Images, Personalized Videos & Memes
Text alone gets overlooked. SBL's AI can automatically embed personalized images, custom video preview thumbnails, and funny relevant memes tailored to the recipient's brand. Visual pattern interrupts spike attention and dramatically increase positive replies.
EmailDay 1 · Not openedLinkedInDay 3 · Connection + noteWhatsAppReplied
04
Automated Multi-Channel Follow-Ups
When a lead doesn't open an email, SBL automatically orchestrates smart follow-ups across Email, LinkedIn, and WhatsApp from a single unified workflow so no deal slips through the cracks.
How it works
From Zero to Live Outreach in 3 Simple Steps
1
Step 1: Pick Your Mailboxes ($0 Domain Charges)
Choose from our instant pool of pre-warmed mailboxes matched to your brand category, or request an on-demand warmup. You never pay a penny for domains.
Pre-warmed mailbox pool
$0 domain fees
| Mailbox | Health | Age | Action |
|---|---|---|---|
| [email protected]Instant · Ready to send | 99% | 8 months | Added |
| [email protected]Instant · Ready to send | 98% | 6 months | Add |
| [email protected]On-demand · 14-day warmup | — | New | Request warmup |
2
Step 2: Set Your Real-Time Intent Triggers
Tell SBL who you want to target and what signals to look for (e.g., Companies hiring SDRs, Funding announcements, or Tool changes).
SBL signal agent
Scanning LinkedIn Jobs
Live
Triggers
Companies hiring SDRs
Funding announcements
Tool changes
in
YourCompany is hiring 3 SDRsLinkedIn Jobs · just now
ICP match
cb
Lumen Health raised a $12M Series ACrunchbase · 4 min ago
ICP match
bw
Fieldcraft moved from Salesforce to HubSpotTech stack change · 9 min ago
ICP match
ph
Orbitly launched a new productProduct Hunt · 12 min ago
Queued
12,480 accounts monitored
4 signals found
3
Step 3: Let SBL Write & Send 1-to-1 Personalized Outreach
SBL’s AI writes unique messages, embeds dynamic rich media (images/videos/memes), and handles follow-ups automatically across Email, LinkedIn, and WhatsApp.
Written by SBL for Sarah
Draft 1 of 248 · all unique
ToSMSarah Mitchell · Head of Growth, YourCompany
Sarah Mitchell · Head of Growth, YourCompanySubjectSarah, inboxes for your 3 new SDRs?
Hi Sarah, saw YourCompany just opened 3 SDR roles. Made something for the team:
YOURCOMPANYAI image
Your SDR team, sending on day one
Hey Sarah, this one's for you
Sarah, a 40-second walkthrough for YourCompany
S
0:42
Nope
Telling your 3 new SDRs to wait 4 weeks for domain warmup
Yep
YourCompany SDRs booking meetings on day one
Follow-ups
Email · Sent
LinkedIn · Day 3
WhatsApp · Day 5
Pricing
Simple Infrastructure & Engine Pricing. No Domain Charges Ever.
Pick the exact mailbox setup that fits your campaign timeline, or unlock full intent lead generation.
On-Demand Warmup
$6.00/ mo per mailbox
- $0 Domain Fees (Included Free)
- 14-Day Supervised Warmup
- Automated SPF, DKIM & DMARC Setup
- Inbuilt SBL Sequencer Included
- Multi-Channel Ready (Email, LinkedIn, WhatsApp)
Zero Domain Fees • No Credit Card Required
Instant Pre-Warmed
Most Popular$9.00/ mo per mailbox
- $0 Domain Fees (Included Free)
- READY TO SEND TODAY
- Aged 6+ Months / 98%+ Deliverability Score
- Automated SPF, DKIM & DMARC Setup
- Inbuilt SBL Sequencer Included
- Multi-Channel Ready (Email, LinkedIn, WhatsApp)
Aged 6+ months • 95%+ Primary Inbox Placement Guaranteed
Add-On Power Engine
Real-Time Intent Signal Lead Generation
Available on all plans or as a standalone engine
Launch Your Intent Engine Free
Includes 5 free on-demand mailboxes + $0 domain fees
Live Buying Signal Detection: Track job postings, funding news, executive changes, and tech stack updates.
ICP Lead Scraping & Verification: Pull clean, verified decision-maker emails directly matched to live intent signals.
Dynamic AI Creative Suite: Auto-generate personalized images, video thumbnails, and memes inside emails.
Full SaaS Autopilot Platform: Starts at $99/month (Includes 5 Free On-Demand Mailboxes + Free Domains).
Compare
How SBL Compares to Other Outreach Tools
| Feature | SBL.so | SSmartlead |
ZZapmail |
IInstantly |
|---|---|---|---|---|
| Time to First Send | Under 1 Day | 3–4 Weeks | Under 1 Day | 3–4 Weeks |
| Domain Charge | $0 (Included Free) | Extra Charge | Extra Charge | Extra Charge |
| Mailbox Pricing | $6 (Warmup) / $9 (Instant) | ~$4.50 + domain | ~$9.00 + domain | ~$8.00 + domain |
| Inbuilt Sequencer | Included | Separate Fee | Not Included | Separate Fee |
| Real-Time Intent Signals | Native | No | No | No |
| Per-Lead Unique AI Copy | Yes (Subject + Body) | Manual Spintax | No | Manual Spintax |
| AI Images, Videos & Memes | Native | No | No | No |
| Multi-Channel Outreach | Email + LinkedIn + WA | Email Only | Email Only | Email Only |
By the numbers
Outbound That Books Meetings on Autopilot
Real performance numbers run across SBL customer campaigns last quarter:
571,168Cold Outreach Messages Sent
95%+Primary Inbox Placement Rate
228,468Replies Tracked (40% Avg Reply Rate)
38,459Qualified Sales Meetings Booked
$38.5MPipeline Generated
One dashboard
Run Email, LinkedIn & WhatsApp from One Master Dashboard
Don't limit your sales team to email alone. SBL connects all three primary outreach channels into a single inbox:
Unified Inbox: Manage Email, LinkedIn, and WhatsApp replies in one place.
Smart Native CRM Sync: Direct 2-way sync with HubSpot, Salesforce, Pipedrive, Zoho, and Zapier.
Developer & AI Integration: Build custom workflows with our Public API or run outreach directly using our Claude / MCP AI Server.
All replies
Email
LinkedIn
WhatsApp
SM
Sarah Mitchell · YourCompany2m
That answers it. Send me a link and I'll take a look.
DK
Dev Kapoor · Lumen Health14m
Thanks for connecting. Open to a call Thursday?
AR
Aisha Rahman · Fieldcraft1h
Yes, please share pricing for 20 mailboxes.
TO
Tom Okafor · Orbitly3h
Loved the meme. Looping in our VP Sales.
Synced to HubSpot
2-way
H
HubSpot
HubSpot
S
Salesforce
Salesforce
P
Pipedrive
Pipedrive
Z
Zoho
Zoho
Z
Zapier
Zapier
S
Slack
Slack
N
Notion
Notion
n
n8n
n8n
Public API
Build your own workflows on top of Sbl.so. Trigger campaigns, pull leads, and sync signals.
Read the API docsClaude / MCP AI Server
Run outreach from Claude or any MCP-compatible AI tool: create campaigns, add leads, check conversations, all in natural language.
Set up the MCP serverFAQ
Frequently Asked Questions
Yes. Unlike Smartlead, Zapmail, Instantly, or traditional registrars, SBL covers domain registration and renewal costs. Whether you buy a $6 on-demand mailbox or a $9 pre-warmed mailbox, the domain, DNS records (SPF, DKIM, DMARC), and setup are 100% free.
- $6 On-Demand Mailboxes: We buy the domain, set up the mailbox, and run a supervised 14-day automated warmup sequence before you send your first campaign.
- $9 Instant Mailboxes: Pulled directly from our aged, high-reputation pre-warmed pool (6+ months old, 98%+ health score). You can log in and start sending campaigns today.
Spam filters flag accounts that send thousands of identical email templates. SBL pairs pre-warmed mailboxes with an AI engine that writes a 100% unique subject line and email body for every single recipient, based on real-time buying signals. Because no two emails look the same, spam filters treat them as organic, 1-to-1 human conversations.
Yes! To boost reply rates, SBL’s creative engine can dynamically insert custom-generated images, personalized video preview thumbnails, and memes tailored specifically to your lead's brand or industry right inside the email body.
Intent signals are events that indicate a prospect is ready to buy (e.g., job postings, funding rounds, company news, or social posts). SBL tracks these signals automatically and uses them to trigger timely, relevant emails that get up to 3x higher reply rates.
Yes! SBL is an all-in-one multi-channel platform. You can create sequences that send a cold email, follow up on LinkedIn, and send a message on WhatsApp from one central workflow.
Ready to Launch Your Cold Email Campaign Today?
Stop paying domain fees and waiting weeks for warmups. Pick your pre-warmed mailboxes, activate live intent signals, and let SBL’s AI engine book meetings for you.
Zero Domain Fees • Instant Setup • No Credit Card Required
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