We use essential technologies to keep this site running. With your permission, we also use analytics, advertising, and functional tools to understand and improve it.Read our Privacy Policy

    Back to Articles
    Integrations•
    October 5, 2026
    •
    6 min read

    How to Connect Smartlead to OutFlo and Use It for Email Outreach

    Send selected leads to Smartlead or add email outreach to your LinkedIn campaign, with a simple setup inside OutFlo.

    By Team OutFlo

    With the Smartlead integration, you can send leads from OutFlo to a Smartlead email campaign without exporting and uploading a CSV. You can choose a group of leads yourself or add a Smartlead step to an OutFlo campaign so the handoff happens when each lead reaches that step.

    OutFlo manages your LinkedIn workflow. Smartlead manages the email sequence, sending accounts, and sending schedule. Together, they let you follow up across both channels from a planned outreach flow.

    Before you start

    Have these ready:

    • An OutFlo workspace.
    • A Smartlead account with an API key available in its settings.
    • A campaign already created in Smartlead.

    An API key is the connection key you copy from Smartlead and paste into OutFlo. You do not need to write code. Keep it private, just as you would a password.

    1. Connect Smartlead to your OutFlo workspace

    1. 1.Sign in to Smartlead and copy your key from its API settings. If you need help finding it, see Smartlead’s key management guide.
    2. 2.In OutFlo, select the workspace where you want to use the integration.
    3. 3.Open Settings, then the Integration tab.
    4. 4.Find Smartlead and select Configure.
    5. 5.Paste the key into Smartlead API key and select Connect Smartlead.
    Smartlead connection screen in OutFlo with the API key field and Connect Smartlead button
    Smartlead connection screen in OutFlo with the API key field and Connect Smartlead button

    Once connected, the Smartlead page shows your available campaigns. Use Refresh if you have just created a campaign in Smartlead and it does not appear yet.

    2. Send selected leads to a Smartlead campaign

    Use this option when you want to review a group of leads before starting email follow-up.

    1. 1.Open your lead list in OutFlo.
    2. 2.Select the individual leads you want to send.
    3. 3.Open Lead actions and choose Add to Smartlead.
    4. 4.Select the destination Smartlead campaign.
    5. 5.Choose the Email column containing the addresses you want Smartlead to use.
    6. 6.Review the preview: valid, missing, and invalid emails, plus example addresses.
    7. 7.Select Add to Smartlead.
    Add leads to Smartlead dialog with the campaign and email column selectors
    Add leads to Smartlead dialog with the campaign and email column selectors

    For example, if your list has both a work email and a personal email column, choose the work email column for business outreach. The preview helps you check that you picked the intended field.

    Missing and invalid addresses are skipped. Fix those addresses in your list before adding those leads again. OutFlo remembers your email-column choice for that list.

    Select individual leads rather than using a selection that spans all pages. You can add up to 4,000 leads per submission.

    Before adding leads, review the campaign in Smartlead. Email sending follows that campaign’s status, sequence, and schedule. A running campaign may begin contacting eligible leads according to its settings.

    3. Add Smartlead to an OutFlo campaign sequence

    Use a campaign step when you want the handoff to happen automatically at a specific point in your outreach.

    OutFlo campaign editor showing Add to Smartlead campaign and Add to Instantly campaign under Multichannel in the Add Action menu
    OutFlo campaign editor showing Add to Smartlead campaign and Add to Instantly campaign under Multichannel in the Add Action menu
    1. 1.Open your OutFlo campaign’s sequence editor.
    2. 2.Select Add Action, then Add to Smartlead campaign under Multichannel, where you want the handoff to happen.
    3. 3.Choose the Smartlead campaign.
    4. 4.Select the Email variable containing each lead’s email address.
    5. 5.Review Pause Smartlead outreach when lead replies in Outflo.
    6. 6.Save the step and review the sequence before launching the campaign.

    An email variable is the campaign field that holds the address for each lead. Make sure it contains email addresses before leads reach this step. Leads without a valid email in the chosen variable skip the step.

    Pause email follow-up when a lead replies

    The Smartlead step’s Pause Smartlead outreach when lead replies in Outflo option is enabled by default. Keep it on when you want a reply in OutFlo to pause Smartlead outreach for the lead enrolled through that step.

    This is useful when a prospect starts a conversation on LinkedIn and you want to avoid continuing the planned email follow-up. Review this option in each Smartlead step you use.

    4. Check the result and review linked leads

    1. 1.Return to Integration → Smartlead.
    2. 2.Find your campaign and select View linked leads.
    3. 3.Use Refresh leads to get the latest information.
    4. 4.To pause selected leads’ email follow-up, tick them and select Pause outreach.

    Total provider leads includes the campaign’s full Smartlead lead count. Linked to Outflo counts leads with a saved connection to OutFlo. These numbers can differ, especially if you also add leads directly in Smartlead.

    If something does not look right

    What you see
    The key is not accepted
    What to do
    Copy the correct Smartlead key again and check for extra spaces. If the key changed, use Update API key.
    What you see
    A campaign is missing
    What to do
    Create it in Smartlead first, then select Refresh in OutFlo. Check that the key can access the campaign you want.
    What you see
    Add to Smartlead is unavailable
    What to do
    Check the workspace connection and your permissions, then select individual leads.
    What you see
    Emails are missing or invalid
    What to do
    Choose the correct email column or variable and correct the addresses.
    What you see
    Leads were added but no email was sent
    What to do
    Review the campaign’s status, sequence, sending accounts, and schedule in Smartlead.

    If you use Instantly too, see the Instantly integration guide.

    FAQ

    Frequently Asked Questions

    Do I need to write code to connect Smartlead?

    No. Copy your Smartlead API key, paste it into the Smartlead integration page in OutFlo, and select Connect Smartlead.

    Does adding a lead start sending emails immediately?

    Email sending follows the Smartlead campaign’s status, sequence, and schedule. Review those settings in Smartlead before adding leads.

    What happens if a lead has no email address?

    Missing or invalid emails are skipped. Choose the correct email column or campaign variable and fill in missing addresses before trying again.

    Can Smartlead outreach pause when a lead replies in OutFlo?

    Yes. In the Smartlead campaign step, keep Pause Smartlead outreach when lead replies in Outflo enabled. You can also select linked leads and use Pause outreach from the Smartlead integration page.

    Share this guide:
    Team OutFlo

    Written by Team OutFlo

    Tushar is the founder of OutFlo, focused on building safe, programmable, and affordable LinkedIn outreach systems for modern GTM teams.

    Ready to transform your LinkedIn outreach?

    Join the growing community of sales professionals and marketers who are revolutionizing their LinkedIn lead generation with OutFlo.