LinkedIn InMail: The Most Underused Tool in B2B Sales
LinkedIn InMail lets you message anyone on LinkedIn — even people you're not connected with. It's the platform's premium messaging feature, available through LinkedIn Premium, Sales Navigator, and Recruiter subscriptions. And most sales teams use it badly.
The average InMail response rate is 10-25%, depending on the study. But well-crafted InMails from targeted senders consistently hit 25-40%. The gap between average and great is enormous — and it comes down to when you send InMails, who you send them to, and how you write them.
This guide breaks down everything you need to know to make InMail a high-performing channel in your outreach stack — from choosing the right prospects to structuring messages that get responses, to integrating InMail with connection requests and email for maximum coverage.
Understand When InMail Beats Connection Requests
InMail and connection requests serve different purposes. Using the right tool for the right situation dramatically improves your results.
Use InMail when: - The prospect has 'Open Profile' enabled (your InMail is free and goes to a receptive audience) - You need to reach C-suite executives who ignore connection requests - The prospect's inbox is their primary LinkedIn interaction (they don't accept connections from strangers) - You have a time-sensitive message (event invitation, breaking news, expiring offer) - Your connection request was already ignored — InMail is a second chance through a different channel
Use connection requests when: - You want a long-term relationship, not a one-off message - The prospect is active on LinkedIn (posts, comments, engages) - You have mutual connections or shared groups (higher acceptance likelihood) - You want to nurture through content after connecting
The hybrid approach (recommended): - Day 1: Profile view - Day 3: Connection request with personalized note - Day 7 (if no acceptance): InMail as a follow-up channel - Day 10: Cold email (if you have their email)
This multi-touch approach ensures you reach prospects through their preferred channel, wherever that is.
InMail allocation by plan (2026): - LinkedIn Premium Business: 15 InMail credits/month - Sales Navigator Core: 50 InMail credits/month - Sales Navigator Advanced: 50 InMail credits/month - Credits roll over for up to 3 months - Accepted InMails return the credit (incentivizing quality)
Write Subject Lines That Get Opened
InMail subject lines are make-or-break. Unlike connection request notes, InMails have a subject line that determines whether your message gets opened. Keep it under 5-7 words and make it relevant.
High-performing subject line formulas:
1. The question: '{{firstName}}, quick question about {{topic}}' - Works because curiosity drives opens - Example: 'Sarah, quick question about your SDR team'
2. The mutual reference: 'Referred by {{mutualConnection}}' - Highest open rates (60%+) when genuine - Example: 'Referred by Mark Chen'
3. The company mention: '{{company}} + {{yourCompany}}' - Signals relevance immediately - Example: 'Stripe + Handshake'
4. The insight hook: 'Noticed {{observation}} at {{company}}' - Shows you did research - Example: 'Noticed the SDR hiring push at Drift'
5. The congrats: 'Congrats on {{achievement}}' - Genuine and positive — hard to ignore - Example: 'Congrats on the Series B'
Subject lines to avoid: - 'Partnership opportunity' (screams spam) - 'Quick call?' (too forward, no context) - 'Introduction' (vague and boring) - Anything over 10 words (gets truncated on mobile) - ALL CAPS or excessive punctuation!!!
A/B testing tip: Run 3-4 subject line variants per campaign. Even small changes ('question' vs 'idea' vs 'thought') can shift open rates by 15-20%.
Structure Your InMail Message for Maximum Response
The best InMails follow a clear structure: hook, context, value, ask. Keep the total message under 400 words — shorter is almost always better.
The HCVA Framework:
H — Hook (1 sentence): Grab attention with something specific to the prospect. Never start with 'I' or 'My name is.'
- Good: 'Your recent post on scaling SDR teams struck a chord — we're seeing the same challenge across our customer base.'
- Bad: 'My name is Alex and I work at Handshake. We offer LinkedIn automation.'
C — Context (2-3 sentences): Establish why you're reaching out and why now. Connect it to something happening in their world.
- Good: 'I noticed {{company}} has been hiring aggressively for sales roles — looks like outbound is a priority. We work with similar teams that are scaling LinkedIn outreach alongside their SDR growth.'
- Bad: 'We help companies automate their LinkedIn outreach. We have many features including multi-sender rotation, CRM integration, and more.'
V — Value (2-3 sentences): What's in it for them? Lead with a specific, relevant benefit. Social proof makes it credible.
- Good: 'Our customers typically see a 45% connection acceptance rate and book 30-40 meetings per month per sender. Teams like {{similarCompany}} scaled from 5 to 15 meetings per week within 60 days.'
- Bad: 'We're the best LinkedIn automation platform on the market.'
A — Ask (1 sentence): One clear, low-commitment CTA. Don't ask for a 30-minute demo — ask for 15 minutes or a quick reply.
- Good: 'Worth a 15-minute conversation to see if this fits? Happy to share how {{similarCompany}} did it.'
- Bad: 'Can we schedule a 45-minute demo this week? Here's my calendar link with 12 available slots.'
Full example: 'Hi Sarah — your post on the challenges of scaling SDR teams really resonated.
I noticed Drift has been hiring aggressively for outbound roles. We work with similar fast-growing teams that are using LinkedIn automation to multiply their pipeline without proportionally growing headcount.
Teams like Gong and Lattice use Handshake to run multi-sender LinkedIn outreach that books 30-40 meetings per month per sender — with a 45% acceptance rate.
Worth a 15-minute chat to see if this fits your scaling plans?'
Time Your InMails for Peak Response Rates
When you send an InMail matters almost as much as what it says. LinkedIn InMails compete with emails, Slack messages, and other notifications — timing determines whether yours gets attention.
Best days to send InMail: - Tuesday and Wednesday: Highest response rates consistently - Thursday: Strong performance, slightly below midweek - Monday: Decent, but prospects are catching up from the weekend - Friday: Lower response rates — people are wrapping up the week - Weekends: Surprisingly effective for C-suite (they check LinkedIn on Sunday evenings)
Best times to send InMail: - 7:00-8:00 AM (prospect's timezone): Before their day gets busy — top performer - 12:00-1:00 PM: Lunch break LinkedIn browsing - 5:00-6:00 PM: End-of-day wind-down when people check notifications - Avoid 9:00-11:00 AM: Peak meeting hours — your InMail gets buried
Time zone matching: - Always send based on the prospect's timezone, not yours - A prospect in London shouldn't get your InMail at 3 AM - Sales Navigator shows the prospect's location — use it
Seasonal patterns: - January: High response rates (new year, new budgets) - June-August: Lower response rates (summer, vacations) - September-October: Strong response rates (Q4 planning) - November-December: Mixed — early November is good, late December drops
Automation tip: Schedule InMails during optimal windows. Sending all your InMails in a 10-minute batch at 2 PM looks automated and misses the best timing windows.
Target the Right Prospects for InMail
InMail credits are limited and valuable. Don't waste them on low-probability prospects. Here's how to prioritize:
High-priority InMail targets: - Open Profile members: InMail is free, and they've opted in to receive messages from anyone - Prospects who viewed your profile: They've shown interest — InMail converts at 2-3x the normal rate - Engaged prospects: People who liked or commented on your content but aren't connected - Previously ignored connection requests: InMail gives you a different channel to the same person - C-suite and senior executives: Often don't accept connection requests but do read InMails
Low-priority InMail targets (save your credits): - Prospects with < 100 connections (likely inactive on LinkedIn) - Profiles with no recent activity (haven't posted or engaged in months) - People outside your ICP (even if their title seems relevant) - Anyone you can reach through a warm introduction instead
Open Profile strategy: - Sales Navigator lets you filter for Open Profile members - These prospects receive your InMail for free (no credit cost) and have voluntarily opted in to messages - Open Profile InMails have 30-40% higher response rates than standard InMails - Always check if a prospect has Open Profile before spending a credit
Credit management: - With 50 credits/month on Sales Navigator, target 2-3 InMails per business day - Track response rates weekly — if below 15%, improve your messaging before continuing - Remember: accepted InMails (responses within 90 days) return the credit
Follow Up on InMails Strategically
Most InMails don't get a response on the first attempt. Strategic follow-up separates persistent professionals from annoying spammers.
InMail follow-up rules:
Can you follow up on InMail? - LinkedIn allows one follow-up InMail if the first wasn't responded to - You cannot send additional InMails after the follow-up until the prospect responds - This makes your follow-up message extremely important — you only get one shot
Follow-up timing: - Wait 5-7 business days after the initial InMail - Don't follow up on the same day or the next day — it feels desperate - Tuesday or Wednesday follow-ups perform best
Follow-up message approach: - Don't repeat your first message — they already saw it (or didn't) - Add new value: a relevant case study, industry stat, or content piece - Keep it even shorter than the original (2-3 sentences) - Change the angle: if you led with a question, follow up with an insight
Example follow-up: 'Hi Sarah — following up on my note last week. Just published a case study on how a team similar to Drift's SDR org booked 40 meetings in month one using multi-sender LinkedIn outreach. Happy to share if useful. Either way, no pressure.'
Multi-channel follow-up: If InMail doesn't work, don't give up — shift channels: - Day 1: InMail - Day 7: InMail follow-up - Day 10: Connection request (different angle) - Day 14: Cold email (if you have their address) - Day 21: Engage with their content (like/comment on a post)
The goal isn't to harass — it's to find the channel where this prospect is most responsive.
Measure InMail Performance and Optimize
Track these metrics to continuously improve your InMail results:
Key InMail metrics: - Open rate: What percentage of recipients opened your InMail? Benchmark: 40-60% - Response rate: What percentage replied? Benchmark: 15-25% (good), 25-40% (excellent) - Positive response rate: What percentage expressed interest? Benchmark: 8-15% - Meeting booking rate: What percentage resulted in a meeting? Benchmark: 5-10% - Credit efficiency: Credits spent per meeting booked. Target: 5-8 credits per meeting
What to test: - Subject lines (biggest lever for open rates) - Opening hook (biggest lever for read-through rates) - Message length (test 100 words vs 200 words vs 300 words) - CTA type (question vs statement, meeting vs reply, specific time vs open-ended) - Sending time and day of week - Prospect segments (which titles/industries respond best?)
Optimization cycle: 1. Run 50 InMails with Variant A 2. Run 50 InMails with Variant B (change one element) 3. Compare response rates 4. Keep the winner, test a new element 5. Repeat monthly
When to stop InMailing a segment: - Response rate below 10% after 100+ sends = messaging or targeting problem - Open rate below 30% = subject line problem - High open rate but low response = message body problem
Common InMail Mistakes That Kill Response Rates
Writing long InMails: Nobody reads a 500-word InMail from a stranger. Keep it under 400 words — ideally under 200. The shorter, the better.
Starting with 'I' or 'My name is': The prospect doesn't care who you are yet. Start with something about them — their company, their challenge, their content.
Using InMail as a first touch without warming up: Profile views and content engagement before InMail dramatically improve response rates. Cold InMail to a completely unaware prospect is your weakest approach.
Wasting credits on low-probability targets: Check for Open Profile first (free InMails), prioritize profile viewers and content engagers, and skip inactive profiles.
Asking for too much in the CTA: 'Can we schedule a 45-minute demo?' is too big an ask from a stranger. Start with '15-minute conversation' or 'quick reply' — lower the commitment.
Sending all InMails at the same time: Batch-sending 20 InMails at 2:15 PM on a Monday looks automated. Space them across optimal time windows throughout the week.
Integrate InMail into Handshake Outreach Sequences
Handshake helps you make the most of your limited InMail credits by integrating them into multi-channel sequences:
- Smart InMail targeting: Automatically identify which prospects should receive InMails vs. connection requests based on their LinkedIn activity, Open Profile status, and engagement signals - Sequence integration: Add InMail as a step in your outreach sequence — send connection request first, then automatically trigger InMail for non-responders - Template management: Store and A/B test InMail templates with dynamic personalization variables across campaigns - Timing optimization: InMails are sent during optimal windows based on the prospect's timezone and LinkedIn activity patterns - Credit tracking: Monitor InMail credit usage and response rates per campaign to maximize ROI on your limited monthly allocation - Multi-channel coordination: Handshake ensures prospects aren't hit with InMail, connection request, and email on the same day — touches are spaced naturally
Frequently Asked Questions
What's a good LinkedIn InMail response rate?
15-25% is solid for B2B outreach. Top performers hit 25-40% with well-targeted, personalized InMails. If you're below 10%, your messaging or targeting needs improvement. Response rates above 30% typically indicate strong targeting to warm or engaged prospects.
How many InMail credits do I get with Sales Navigator?
Sales Navigator Core and Advanced both include 50 InMail credits per month. Credits roll over for up to 3 months (max 150 accumulated). Accepted InMails (where the prospect responds within 90 days) return the credit, so higher response rates effectively give you more credits.
Is InMail better than connection requests for outreach?
Neither is universally better — they serve different purposes. Connection requests build long-term relationships and allow ongoing messaging. InMails reach people you're not connected with, including those who ignore connection requests. The best strategy uses both: connection request first, InMail as a follow-up channel for non-responders.
Can I automate LinkedIn InMails?
You can automate InMail sending through tools like Handshake that integrate with Sales Navigator. However, because InMail credits are limited, automation should be targeted carefully — not broadcast. Automate the sending, but be selective about who receives InMails.
Do InMails work for reaching C-suite executives?
Yes — InMail is often the best channel for C-suite. Senior executives frequently ignore connection requests from strangers but do read InMails, especially those with relevant, concise subject lines. Keep messages ultra-short (under 150 words) for executive audiences.