How to Find Emails for LinkedIn Post Engagers (and What to Send Them)

A guest post by Saniya Sood, who works on growth at Valley.

The people who react to or comment on a LinkedIn post have already shown interest in its topic, which makes them a better list than one built from filters. To reach them by email: collect the engagers, keep only the ones who fit your ideal customer profile, find their verified work emails, then send a short note that picks up the conversation the post started. This guide covers each step and what to send.

Why LinkedIn post engagers make a better list

A list built from job titles and company size reaches people who have no particular reason to hear from you this month. A post engager has just spent attention on a topic you care about. That is a timing advantage most lists do not have.

It also works on other people's posts. Reaction and comment lists on public LinkedIn posts are visible to anyone, so an industry voice's post or a podcast host's post about your problem space can become a list too.

The gap between warm and cold is large. According to Valley's data from more than 30 million messages sent through over 1,000 LinkedIn accounts, warm, signal-based outreach gets 15 to 45% reply rates, against about 2% for cold outreach.

Step 1: Collect the engagers

Start with one post that is close to the problem you solve. Your own posts work, and so do relevant posts by others.

• Manually: open the post's reactions and comments and copy names, titles and companies into a sheet. Slow, but fine for a few dozen people.
• With a tool: Derrick's LinkedIn post likes and comments import pulls reactors and commenters into a table in one step, with their name, title, company and profile URL. It costs 1 credit per engager imported and works on the free plan.

Whichever route you take, keep volumes reasonable and know LinkedIn's rules on automated collection, set out in its User Agreement.

Commenters are usually worth more than reactors: writing a comment takes more intent than clicking a reaction, and the comment itself tells you what the person thinks.

Step 2: Keep only the people who fit

A popular post can collect hundreds of engagers. Expect a large share to be outside your market: peers in your industry, job seekers, creators, and vendors selling to people like you.

Filter on three things before spending a single credit:

• Company fit: size, industry and market match your ideal customer profile.
• Role fit: the person owns, influences or feels the problem you solve.
• Existing relationship: current customers, open deals and known contacts go to their account owner, not into a new sequence.

A tight list of 40 people who fit beats 400 names you will never write well to.

Step 3: Find their verified work emails

With the filtered list in front of you, find each person's professional email from their name and company domain, or straight from their LinkedIn URL.

The point is not just to get an address but a deliverable one. Sending to guessed addresses is how domains end up with bounce rates that hurt every later send. Derrick's Email Finder only returns addresses it has already verified, so there is no second pass to run on what it finds. It costs 5 credits per email found, and nothing when no email is found.

Derrick runs wherever your list lives: in the web app, in the Google Sheets add-on, from Claude or ChatGPT through the MCP server, or in your own workflows through the REST API. The free plan includes 100 credits a month and the post engager import. Email Finder starts on the Standard plan at €20 a month, and unused credits never expire while you stay on a paid plan.

Derrick pricing checked on derrick-app.com/pricing, 20 October 2026.

Already have addresses from somewhere else, like an old CRM export or a list a colleague shared? That is what Email Verification is for, at 1 credit per email checked. For anyone you could not find an address for, keep the person on the list for LinkedIn instead.

Step 4: Write the follow-up

The post is your reason to write. It should not be the whole message.

Weak follow-ups thank the person for liking a post and then pitch. Better ones use the post as a bridge to something about them:

• Weak: "Hi Tom, thanks for liking my post about outbound. We help teams like yours book more meetings. Do you have 15 minutes this week?"
• Stronger: "Hi Tom, you commented that list quality is the real problem behind low reply rates. Saw your team just opened two SDR roles. Curious how you are planning to feed them leads in the first quarter?"

Keep it under 80 words, make one point, and end with a question that is easy to answer. Use the same idea in the LinkedIn connection note and the email, so whichever channel the person sees first, the second one feels connected rather than repeated.

Step 5: Decide what to run by hand and what to automate

For one post a week, the manual version works well: collect, filter, enrich, write, send. It takes an hour or two.

It stops working when several posts a week need follow-up, when more than one person on the team sends, or when the follow-up needs to happen within a day of the post. That is usually when teams automate the capture and the drafting and keep a person reviewing every message.

A data tool such as Derrick handles the email layer: finding verified addresses in the app or the sheet you already use. A sequencing tool handles the sending. Valley, an AI outbound platform, can message LinkedIn post engagers as part of its signal capture: each engager is checked against your ideal customer profile, researched, and given a personalized draft in your voice to approve, across LinkedIn and email.

Whatever the stack, the order stays the same: filter, verify, then write something worth reading.

When not to email a post engager

• They engaged as a peer, not a buyer. A sales leader at a company that sells what you sell is not a prospect.
• You could not find a verified address. Do not send to a guessed address to see what happens. Use LinkedIn instead.
• The post was off-topic for what you sell. A like on a personal milestone post is not a reason to pitch.
• Your local rules say no. Rules on B2B email outreach vary by country. Check what applies to you before sending.

About the author

Saniya Sood works on growth at Valley, an AI outbound platform that finds the people most likely to buy and sends personalized messages across email and LinkedIn.