Extended definition
On LinkedIn, you can only message people you’re connected to — unless you pay for InMail. InMail is the paid currency that lets recruiters reach outside their network, which is almost all sourcing.
Every LinkedIn Recruiter seat comes with a monthly InMail credit allocation; you can buy more if needed. InMail is the single most-used outreach channel in modern sourcing.
Its effectiveness has shifted over the years — response rates were higher when InMails were rare, have softened as usage has scaled, and now sit in the 10-30% range for well-crafted messages. InMail quality is increasingly the differentiator; volume alone no longer produces pipelines.
How InMail works
LinkedIn InMail mechanics:
- Credits — Each LinkedIn Recruiter seat includes a fixed number of InMail credits per month (typically 30-150 depending on plan). Credits are returned if a candidate responds within 90 days — making response rate a direct lever on sourcing efficiency. The credit return is what makes good InMail writing so economically important.
- Open InMail — Some LinkedIn members turn on Open Profile, which lets any LinkedIn Recruiter message them without spending a credit. This is more common among active candidates and people in certain industries.
- Subject line and body — The subject line is often the response/no-response decision point. The body should be short — typically under 150 words — with a personal hook, a clear role pitch, and a specific ask.
- InMail Analytics — LinkedIn shows response rates per recruiter, per message template, and per role family. Teams using LinkedIn Recruiter properly review this data weekly, iterate templates, and benchmark recruiters against each other.
- Response behaviour — Candidates respond more when subject lines reference something specific to them rather than generic role titles, when messages are short rather than long, and when the ask is small (“worth a 15-minute chat?”) rather than big (“send me your CV”).
- Integration with sequences — Modern sourcing tools (Gem, SourceWhale) let recruiters combine InMail with email sequences, spacing messages across channels to lift overall response.
Strong InMail practice takes time to build. Most sourcers see response rates climb over 6-12 months as they learn what works in their market and refine templates. The teams that ignore InMail data typically plateau at low response rates and blame the platform.
Why InMail matters
InMail is where most sourcing spend actually goes. LinkedIn Recruiter seats aren’t cheap, and most of their value comes from InMail outreach.
A team with 15% InMail response rates gets roughly half the pipeline of a team with 30% response rates from the same seat count. That’s a direct productivity multiplier.
For VPs of TA budgeting recruiting tooling, InMail response rate is one of the few metrics that directly translates to dollars per hire. It also sets the tone for candidate experience: bad InMails are the first impression a passive candidate forms of the employer brand.
Common mistakes and misconceptions about InMail
- Sending long InMails — Candidates skim. Messages over 200 words get lower response rates than short, specific messages under 120 words.
- Leading with the company — Most InMails open with three lines about the hiring company. Candidates don’t care yet. Lead with them — something about their work, background, or role.
- Generic subject lines. “Exciting opportunity at [Company]” is the most common subject line and one of the worst. Specific subject lines — referencing their role, a shared connection, or the specific hook — outperform consistently.
- Ignoring InMail analytics — LinkedIn provides per-template response data. Teams that don’t review it keep running templates that have stopped working.
- Treating InMail volume as the metric — Sending 500 InMails at a 5% response rate produces less pipeline than 200 InMails at 25%. Quality beats quantity on credits, time, and candidate experience.
Frequently asked questions
What is InMail?
InMail is LinkedIn's paid direct messaging product that lets recruiters contact candidates they aren't connected to. Response rates typically range from 10-30% depending on role, message quality, and candidate seniority. InMail is the paid currency that lets recruiters reach outside their network, which is almost all sourcing.
What's a good InMail response rate?
For general outreach to passive candidates, 15-25% is solid, 25-30% is strong, and above 30% is excellent and usually reflects tight targeting plus strong brand. Below 10% signals the targeting, messaging, or both need work. Benchmarks vary significantly by role type and seniority.
How long should an InMail be?
Under 150 words. The most effective InMails are 80-120 words, structured as a short personal hook, a one-line role pitch, and a specific, low-friction ask. Longer messages reliably get lower response rates, regardless of how well-written they are.
Do you get InMail credits back for responses?
Yes. LinkedIn returns the InMail credit if the candidate responds within 90 days, whether the response is positive or negative. This is why response rate is so directly tied to recruiting cost — a higher response rate effectively lowers the cost per InMail sent.
Is InMail worth it compared to email?
InMail has the advantage of reaching candidates whose email isn't public. Email has the advantage of being free, often more personal, and better for long-form messaging. Most effective sourcing teams use both — InMail for initial outreach, email for follow-up once the candidate's contact is surfaced.