Switching from Reply.io to lemlist: the complete checklist (2026)

What data transfers from Reply.io to lemlist (and what stays behind)

Switching outreach platforms usually comes down to one question: what can I actually bring with me? Reply.io lets you save contacts, export them as a CSV file, and sync to CRMs including Salesforce, HubSpot, and Pipedrive. That means your contact lists, custom fields, and email copy can all travel with you.

What won’t follow you automatically is engagement history. Reply.io tracks opens, clicks, replies, and bounce data per sequence, but those metrics live inside Reply.io’s reporting layer. Once your account is closed, that data is gone. The same goes for API webhook configurations, internal lead scores, and any automation triggers you’ve built between Reply.io and other tools.

Here’s what to expect:

Pre-migration checklist before you touch anything in Reply.io

Before you export a single file, take care of a few things that are easy to forget and painful to fix later.

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  Pause active sequences. Any sequence still sending will create overlap once you start lemlist campaigns. Pausing also freezes leads in place so you know exactly where each contact left off.

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  Export or screenshot campaign performance reports. These are your baseline. You’ll want Reply.io reply rates and bounce rates on hand to compare against your first weeks in lemlist.

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  Note your CRM field mapping. Write down which Reply.io fields sync to which CRM fields. You’ll recreate this mapping in lemlist’s integration settings, and guessing later wastes time.

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  Flag leads mid-sequence. Tag or filter contacts who are partway through an active sequence. These contacts require special handling during import (more on this below).

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  Confirm DNS access. You’ll update SPF, DKIM, and DMARC records when setting up lemlist, so make sure you can log into your domain registrar or DNS provider.

How to export your contacts and campaign data from Reply.io

1. Export your full contact list as CSV

In Reply.io, you can find contacts in the People section and export them, including downloading contact lists as CSV files. Select all contacts, not just the ones in a single sequence. If you’ve used custom fields (industry, persona, pain point), confirm those columns appear in the export view before downloading.

2. Export your opt-out and suppression list

Reply.io lets you enforce do-not-contact rules by adding bounced domains, opted-out addresses, and competitor domains to blacklist rules. You’ll find this data under your account’s blacklist settings. Download it as a separate file. Skipping this step means risking re-contacting people who asked to be removed, which damages sender reputation and can violate CAN-SPAM or GDPR.

3. Document your active sequences and copy

Reply.io doesn’t offer a one-click sequence export. You’ll copy each sequence’s steps (subject lines, body text, delays, conditions) into a spreadsheet or Google Doc manually. This is the most time-consuming part of the migration, but it’s also a useful forcing function: you’ll naturally spot sequences that aren’t performing while you go through them.

4. Save your campaign performance data

Export or screenshot Reply.io analytics for every active and recently completed sequence. Capture reply rates, bounce rates, and per-step performance. You’ll use this data to set benchmarks for your lemlist campaigns and to decide which sequences are actually worth rebuilding.

How to import Reply.io data into lemlist and map your fields

1. Prepare your CSV for lemlist’s format

In lemlist, the required column is email (every lead has to have one), with optional columns for any additional personalization data. The first row has to contain column names, not data. If your first row contains an actual email address, lemlist treats it as a column name and skips that lead — see lemlist’s CSV import guide for the full requirements.

lemlist auto-maps standard variables like email, firstname, lastname, companyName, companyDomain, linkedinUrl, phone, picture, and icebreaker. If your Reply.io CSV uses different column names, rename them before uploading to save yourself a round of manual mapping.

2. Upload and map columns to lemlist variables

During the “Set up imported custom variables” step, assign each CSV column to the correct lemlist variable type. This is what makes lemlist recognize fields like {{email}} and {{linkedinUrl}} in your campaign steps — see lemlist’s guide on choosing the right CSV import type. For Reply.io fields that don’t match a default lemlist variable, create a custom variable during import, and lemlist will carry it through your sequences.

3. Enrich leads during import to fill data gaps

Reply.io contacts that are even a few months old may have stale emails or missing phone numbers. lemlist’s waterfall enrichment queries 14+ data providers in sequence to verify emails and find direct dials during or right after import. Running enrichment at this stage means you’re starting campaigns with clean, verified data instead of importing someone else’s data debt.

How to rebuild your Reply.io sequences as lemlist multichannel campaigns

1. Audit your Reply.io sequences for what to keep

Pull up the performance data you saved earlier. If a sequence had a reply rate below 1–2%, it’s probably not worth recreating. Focus your energy on rebuilding the two or four sequences that were actually generating replies or booked meetings.

2. Build multichannel sequences in lemlist’s campaign editor

In lemlist, you import leads via CSV, CRM, LinkedIn, Signals, manual entry, existing campaign, API, or Zapier (see lemlist’s campaign creation guide), then build your sequence with email steps, delays, and conditions (if opened, if clicked, if no reply). If the idea of rebuilding from scratch feels heavy, lemAgent can generate a full multichannel sequence from a plain-language description of your goal and ICP. You describe what you want, review the output, adjust, and launch.

3. Add channels Reply.io didn’t support well

This is where the migration starts paying for itself. lemlist supports LinkedIn automation (profile visits, connection requests, voice messages), in-app calling with a native dialer, SMS steps, and WhatsApp outreach as campaign steps. If you were email-only in Reply.io, adding even one LinkedIn touchpoint or a post-call SMS follow-up can change your reply rates entirely.

How to transfer your opt-out list and avoid double-sending

Upload the suppression file you exported from Reply.io into lemlist’s blacklist. A suppression list is compliance infrastructure. It’s the control layer that keeps marketing, sales, support, and outbound systems from contacting people who opted out, complained, bounced, or no longer qualify for outreach. If that layer is weak, every campaign inherits the risk.

To prevent double-sending to leads who already received recent outreach in Reply.io, check lemlist’s duplicate detection during import. It flags contacts already present in other campaigns, so you can decide whether to skip them or add them at a later step in the new sequence.

Deliverability during migration: warming up lemlist while winding down Reply.io

The biggest risk during any platform switch is a deliverability drop. You’re asking inbox providers to trust a new sending identity overnight, and that trust takes time to build.

Setting up domains and authentication in lemlist

lemlist lets you connect an existing sending domain or purchase a new one directly inside the platform, with DNS authentication (SPF, DKIM, DMARC) configured automatically. If you’re reusing the same domain you used in Reply.io, your existing DNS records may only require minor updates. New domains will require full setup, which lemlist walks you through step by step.

Running lemwarm before you send a single campaign

lemwarm is lemlist’s built-in warm-up and deliverability booster that comes with every lemlist seat. lemwarm exchanges real emails across a network of more than 10,000 real accounts and generates human-like content for each message, so your inbox builds a reputation through genuine conversations rather than fake traffic.

Warm-up runs in two phases before any campaign: roughly 2–3 weeks of ramp-up to reach your target volume, then 2 weeks of stabilization with no spam, so about one month in total — see lemlist’s lemwarm setup guide for the full schedule. If you’re migrating with an existing domain that already has a good reputation, this timeline is often shorter.

Ramping send volume while reducing Reply.io sends

Run both platforms in parallel for a brief overlap. During week one, send new campaigns only through lemlist at low volume while Reply.io handles sequences already in progress. Each day, increase your lemlist send volume slightly and reduce Reply.io sends by the same amount. Keep lemwarm on at 10 to 20 per day even after campaigns start. If spam placement rises in lemwarm, that’s the early warning that lemlist activity is hurting your inbox. Pull back fast.

How to reconnect your CRM without losing sync history

Good news: CRM sync history from Reply.io stays in your CRM. Deal records, activity logs, and contact notes don’t disappear when you stop using Reply.io. What you do have to rebuild is the field mapping and automation triggers on the lemlist side.

lemlist has native integrations with HubSpot and Salesforce, plus connectors for Pipedrive, and support for Zapier, Make, and API-based workflows. Walk through your Reply.io CRM sync settings (the ones you documented earlier) and replicate each mapping in lemlist’s integration settings. Pay extra attention to status fields and activity logging so your CRM timeline stays consistent across tools.

Reply.io features mapped to their lemlist equivalents

If you relied on a specific Reply.io feature, here’s where to find the equivalent in lemlist:

Week-by-week migration timeline for a 5-person sales team

Week 1: prep and parallel setup

Export all Reply.io data (contacts, sequences, opt-outs, analytics). Create your lemlist account, connect sending domains, and start lemwarm. Begin configuring your CRM integration.

Week 2: data migration and sequence rebuild

Import contacts into lemlist, map fields, run enrichment on stale data. Rebuild your top-performing sequences as multichannel campaigns. Upload your suppression list. Run inbox placement tests through the Deliverability Hub.

Week 3: cutover and monitoring

Shift all sending to lemlist. Pause any remaining Reply.io sequences. The Deliverability Hub is a dedicated area in lemlist that brings your deliverability insights into one place, across lemwarm (Warm-up), lemlist (Outreach), and Inbox placements — see lemlist’s Deliverability Hub guide. Use it to watch bounce rates, inbox vs. spam ratios, and warm-up health daily. Confirm CRM sync is logging correctly. Downgrade or cancel Reply.io once you’ve verified no data is still needed.

What your outbound gains after the switch

Once the migration is complete, your outbound runs from a single platform instead of a patchwork of tools. You have multichannel campaigns across email, LinkedIn, calls, SMS, and WhatsApp in one workflow. Waterfall enrichment fills data gaps that Reply.io’s single-source approach left behind. Intent signals surface the right moment to reach out, instead of relying on static lists and guesswork. And lemwarm runs inside lemlist’s Deliverability Hub, so warmup and outreach share one dashboard and one set of numbers.

That’s the real payoff of switching: fewer tabs, fewer blind spots, and more of your emails landing where they belong.