01
Manual follow-ups kill productivity
Checking who replied, who bounced, who needs follow-up — across spreadsheets and tabs. Twenty minutes a day becomes two hours by Friday.
~10 hrs / week per rep
ProductCampaignsLive
Write once.
Send forever.
Reply-aware always.
Multi-step cold email campaigns that pace sends, track opens, capture replies, and stop the moment a lead engages. Build your cold email sequences once — Sendlio runs the rest, across every inbox, every lead, every day.
14-day free trial · No credit card · 279+ teams running campaigns
87
Campaign progressQ2 Founder Outreach18% reply rate
Live sequence · todayLive
- S2Step 2 sent · 48 leads3 minutes agoQueued
- REReply captured · stopped sequence8 minutes agoReply
- OP3 opens · hottest leads14 minutes agoOpen
Meetings bookedThis campaign
7+ stepsUnlimited sequence depth per campaign
∞ accountsDistribute sends across unlimited inboxes
24/7Automated pacing, tracking, stop-on-reply
FullOpen, reply, bounce, per-step analytics
Supported providers
Send from any inbox your team uses.
Google WorkspaceGmail · GSuite
Microsoft 365Outlook · Exchange
Zoho MailBusiness mail
iCloud MailApple accounts
Yahoo MailPersonal + business
Custom SMTPAny IMAP/SMTP host
The problem
Sequences fail for three reasons — and they all cost pipeline.
Running cold email without automation means manually tracking who got what, when, and whether they replied. One missed follow-up on a hot lead is a deal gone. One follow-up after someone replied is a deal killed. Most teams learn the hard way.
02
One account = deliverability roulette
Sending 500 emails a day from a single inbox burns sender reputation fast. ISPs flag the spike, opens crash, replies dry up — all from one bad week.
domain reputation tanks
03
No signal = no smart follow-ups
Without open tracking and per-step analytics, every lead is treated the same. You can't prioritize warm leads, can't tell which step converts, can't improve what you can't measure.
hot leads go cold, quietly
What you get
Not features. Pipeline.
Three things that change the day you stop running sequences by hand. Customer outcomes, not feature lists.
Outcome 01 · Stop-on-reply
Every lead runs at their own pace — and stops the second they engage.
Each lead moves through the sequence independently, based on their own send date. The moment they reply, Sendlio halts every future send for that lead. No more embarrassing follow-ups to a live conversation. No more killed deals.
- Per-lead tracking. Every prospect has their own step count, timestamp, and outcome.
- Instant stop on reply. Sequence halts the moment a response lands — no race conditions.
- Natural pacing. Sends spaced by minutes, not seconds — mimics real human outreach.
Q2 Founder Outreach · 4-step sequenceActive
DAY 1Quick intro — 2 min?Hi {{first_name}}, saw you're scaling...
Sent 180Open 94Reply 14
DAY 4Bumping this upJust floating this back to the top...
Sent 158Open 72Reply 8
DAY 9Worth a quick look?Putting this one last ping on your radar...
Sent 132Open 51Reply 6
DAY 14Closing the loopNo worries if timing is off — will step away.
Sent 88Open 22Reply 3
Outcome 02 · Multi-account sending
Spread volume across inboxes. Protect every domain.
Connect multiple email accounts and Sendlio distributes sends across all of them, respecting each one's daily cap. Higher volume without burning any single inbox. Agencies run one campaign across five client accounts. Teams keep their primary domain reputation pristine.
- Per-account daily limits. Each inbox has its own cap — nothing overloads.
- Timezone-aware scheduling. Send at 9am their time, not yours.
- Text-only delivery mode. Plain-text first emails land in primary, not promotions.
One campaign. Many inboxes.Sendlio spreads volume across every connected account, respects each one's daily cap, and lands in your prospect's working hours — not yours.Live routing
Outcome 03 · Full analytics
Know what works. Down to the step. Down to the day.
Sent, opens, replies, bounces — tracked per campaign, per step, per day. Spot the step where leads drop off. Identify your highest-converting subject line. Watch deliverability trends over 30 days. Every metric is live and actionable.
- Per-step breakdown. See exactly which sequence step converts — and which kills momentum.
- Time-series charts. Daily buckets with zero-fill — no misleading gaps.
- Open tracking built-in. Know who's warming up before they reply.
Every step. Every metric.Sent, opens, replies, bounces — tracked per campaign and broken down by sequence step. Spot the drop-off. Double down on what converts.Live dashboard
How it works
Four steps. Campaigns that run themselves.
Draft the sequence, upload your leads, pick your schedule, launch. Sendlio handles sequencing, pacing, tracking, and follow-ups from the moment you hit go.
STEP 01
Build the sequence
Add 3 to 7 steps with templates and delays. Drop in {{first_name}}, {{company}}, or any CSV column. Fallbacks keep every send personalized.
5 minutesSTEP 02
Upload your leads
Drop in a CSV. Duplicates auto-removed. Email providers detected via MX lookup. Dead addresses flagged before a single send.
60 secondsSTEP 03
Pick your schedule
Set date range, business hours, days of week, timezone. Assign as many connected inboxes as you need. System respects every rule.
2 minutesSTEP 04
Launch + track
Hit launch. Live dashboard shows sends, opens, replies, bounces per step per day. Replies auto-stop their own sequence.
Zero babysittingWhy Sendlio
Not every campaign tool is built for reply-aware outbound.
Most cold email tools blast sequences at leads without tracking who engaged — and keep sending after someone replies. Sendlio was built by operators who learned the hard way: every send needs context, every reply needs to stop the sequence, every metric needs to be live.
| Capability | Basic sender tools | Sendlio Campaigns |
|---|---|---|
| Stop-on-reply | Keeps sending after reply | Stops the moment reply logs |
| Per-lead pacing | Batch-based, all same speed | Each lead at their own cadence |
| Multi-account distribution | Single inbox, limited volume | Unlimited accounts, per-account caps |
| Timezone-aware sending | Server time only | Prospect local time, any IANA zone |
| Per-step analytics | Campaign-level only | Step-by-step breakdown |
| Open tracking | Always on or never | Per-campaign toggle, pixel-based |
| Text-only delivery mode | HTML only | All-text or first-step only |
| Spam content scanner | Not included | Pre-launch keyword scoring |
Security + reliability
Infrastructure you can hand to legal, IT, and ops.
We decrypt SMTP credentials only at send time — never store plaintext, never log passwords. Every queue isolated. Every job precision-timed. Built to pass the same checks your enterprise buyers will run.
Bank-grade encryptionAES-256 on every stored credential. Decrypted only at send time, never logged.
Precision schedulingEvery send carries an exact timestamp. No batched blasts — sends fire at the right moment, every time.
Isolated pipelinesCampaigns, warmup, and replies each run on their own infrastructure — zero cross-contamination.
Validation-first launchesMissing a template, schedule, or account? Sendlio blocks launch and tells you exactly what's wrong. No silent failures.
Customer love
What 279+ operators say about Sendlio.
"Sendlio is by far the best outreach tool I have ever used. It's reliable, smart, and saves us hours every week."
"Sendlio is by far the best outreach tool I have ever used. It's reliable, smart, and saves us hours every week."
Sofia Lindstrom
Marketing Consultant
"Since integrating Sendlio, our campaigns have become 10× more efficient. It's smooth, powerful, and doesn't require babysitting."
Luca Moretti
Growth Strategist
"Our agency manages 10+ domains. Sendlio keeps them warm and healthy without lifting a finger. Honestly, it's the best tool we didn't know we needed."
Mateo García
Founder, MailForce
"We stopped worrying about domain reputation after switching to Sendlio. It works in the background and keeps our emails out of spam."
Sam Sen
General Manager
"With Sendlio, cold emails finally reach inboxes — no fluff, no spam. Clean, reliable, and ready for serious senders."
Sarah Sen
Operations Lead
"Sendlio's automation takes care of inbox health so we can focus on outreach. Super easy to use and surprisingly powerful under the hood."
John D'Crouze
B2B Growth Advisor
"Every cold emailer should use Sendlio. It protects your domain, boosts deliverability, and gives confidence with every send."
Niko Tanaka
Sales Director
"Sendlio is by far the best outreach tool I have ever used. It's reliable, smart, and saves us hours every week."
Sofia Lindstrom
Marketing Consultant
"Since integrating Sendlio, our campaigns have become 10× more efficient. It's smooth, powerful, and doesn't require babysitting."
Luca Moretti
Growth Strategist
"Our agency manages 10+ domains. Sendlio keeps them warm and healthy without lifting a finger. Honestly, it's the best tool we didn't know we needed."
Mateo García
Founder, MailForce
"We stopped worrying about domain reputation after switching to Sendlio. It works in the background and keeps our emails out of spam."
Sam Sen
General Manager
"With Sendlio, cold emails finally reach inboxes — no fluff, no spam. Clean, reliable, and ready for serious senders."
Sarah Sen
Operations Lead
"Sendlio's automation takes care of inbox health so we can focus on outreach. Super easy to use and surprisingly powerful under the hood."
John D'Crouze
B2B Growth Advisor
"Every cold emailer should use Sendlio. It protects your domain, boosts deliverability, and gives confidence with every send."
Niko Tanaka
Sales Director
"Sendlio is by far the best outreach tool I have ever used. It's reliable, smart, and saves us hours every week."
Sofia Lindstrom
Marketing Consultant
"Since integrating Sendlio, our campaigns have become 10× more efficient. It's smooth, powerful, and doesn't require babysitting."
Luca Moretti
Growth Strategist
"Our agency manages 10+ domains. Sendlio keeps them warm and healthy without lifting a finger. Honestly, it's the best tool we didn't know we needed."
Mateo García
Founder, MailForce
"We stopped worrying about domain reputation after switching to Sendlio. It works in the background and keeps our emails out of spam."
Sam Sen
General Manager
"With Sendlio, cold emails finally reach inboxes — no fluff, no spam. Clean, reliable, and ready for serious senders."
Sarah Sen
Operations Lead
"Sendlio's automation takes care of inbox health so we can focus on outreach. Super easy to use and surprisingly powerful under the hood."
John D'Crouze
B2B Growth Advisor
"Every cold emailer should use Sendlio. It protects your domain, boosts deliverability, and gives confidence with every send."
Niko Tanaka
Sales Director
FAQ
Answers operators ask. In plain English.
No dev jargon. No marketing fog. Real questions with real answers — the same ones we give on sales calls.
How many sequence steps can one campaign have?
No hard limit. Most teams run 3 to 7 steps spaced across 2 to 4 weeks. You set the template, the send delay, and the system handles every lead through every step automatically — at their own pace.
What if a lead replies mid-sequence?
Sendlio stops the sequence for that lead instantly. The moment a reply is logged, future sends are skipped and the lead is marked replied. No embarrassing "just following up" emails after someone already responded.
Can I send from multiple email accounts at once?
Yes. Connect as many accounts as you need and assign them to a campaign. Sendlio distributes sends across accounts within each one's daily limit — higher volume without burning a single inbox.
How does personalization work?
Drop variables like {{first_name}} or {{company}} anywhere in subject or body. Pull any column from your CSV. Set fallbacks with {{first_name:there}} so no email ever shows blank placeholders. Every send looks hand-written.
Can I track opens?
Yes — opt-in per campaign. An invisible tracking pixel logs opens on email load. Disable it for plain-text campaigns where pixels can trigger spam filters. You choose per campaign.
What happens with bad email addresses?
Sendlio detects bounces before and after sending. MX lookup runs at CSV import to catch bad domains. Post-send bounces flag the lead and exclude future sends. Keeps bounce rates low and sender reputation intact.
Can I schedule campaigns in my prospect's timezone?
Yes. Set start date, end date, time window (e.g., 9am–6pm), days of week, and timezone per campaign. Everything resolves to local time — send at 9am their time, not yours.
What if I want to re-run a winning campaign?
Clone it. Full copy of sequence, templates, schedule, leads — leads automatically reset to not_contacted. Change what you need, launch. Takes under two minutes.