Good email subject lines for cold emails name the reason this person is hearing from you and the topic, in a few plain words and without a sales pitch. As a rule of thumb, 40 to 60 characters is enough, because many mail apps on phones cut longer subject lines off in the inbox preview, so the part that matters goes first.
Below you'll find 40 subject line examples sorted by situation: first contact, follow-up, after a call, referrals, recruiting and job applications. Plus what changes when you write an InMail on LinkedIn. Last updated: 28 September 2026.
What a cold email subject line has to do
In the inbox, your recipient sees the sender, the subject and, depending on the app, a line of preview text. That's what they use to decide whether to open, save it for later or delete it. So the subject line doesn't need to persuade anyone. It only needs to say honestly why this email concerns them.
On length: there is no fixed character limit for email subject lines that decides what gets shown. How much stays visible depends on the mail app, the device and the font size. The 40 to 60 characters are a rule of thumb, not a measured benchmark. In practice, put the hook (company, occasion, the name of whoever referred you) at the start. If the rest gets cut off, the part that counts is still there.
Aspect | Weak subject line | Better subject line |
|---|---|---|
Relevance | Quick introduction | Question about your sales push in Austria |
Specificity | An idea for you | Idea for your trade show follow-up |
Tone | EXCLUSIVE OFFER!!! | Two examples from manufacturing |
Honesty | Re: our conversation (with no conversation) | Your post on trade show leads |
Length | How we help mid-sized companies book more qualified meetings every month | More meetings from LinkedIn for [company]? |
Rules for email subject lines for cold emails
Specific beats curious
“Quick question” on its own says nothing. “Quick question about your hiring in Leeds” says what it's about and still doesn't read like an ad. Curiosity subject lines with no substance might earn an open, but rarely a reply, because the first sentence can't deliver on the promise.
Lead with the connection
The strongest opening is a detail that is only true for this recipient: their post, the new office, a mutual contact, last week's call. If you can't find one, that usually means the person doesn't belong in your target audience.
No clickbait, no capital letters
All caps, exclamation marks, “free”, “today only” and emojis make a B2B email look like a newsletter. Write the subject line the way you would write it to a colleague: sentence case, no punctuation fireworks.
No fake “Re:” or “Fwd:”
Putting “Re:” in front of a first email pretends there was a conversation that never happened. It might win an open and it costs trust at the same moment, because the first sentence gives the trick away. “Re:” is only genuine when you reply to your own email in the same thread.
Subject line and first sentence belong together
The subject line announces, the first sentence delivers. If the subject says “Your post on trade show leads”, the email opens with that post, not with your company pitch.
Use the first name only for a reason
The recipient's first name in the subject line doesn't prove personalization; any mail merge can do that. Use it when the rest of the line would otherwise feel generic, and leave it out when the topic already carries the connection.
40 subject line examples by situation
Square brackets are placeholders. Replace them with real details, or the template turns into a mass email.
First contact (10)
No. | Subject line | Use it when … |
|---|---|---|
1 | Question about your sales push in [region] | the company is expanding into a region |
2 | [Company] and [topic]: quick question | you know the company and the topic, not much more |
3 | Your post on [topic] | the person wrote about it publicly |
4 | Idea for your [process] | you have a concrete suggestion |
5 | Question about [trade show] in [month] | you're both attending the same event |
6 | After your new office in [city] | there's public company news |
7 | How your team books meetings with [audience] | you want to talk about their process, not your product |
8 | Quick question about [process] at [company] | you want an opinion, not a meeting |
9 | We were both at [event] | you met there or both spoke there |
10 | Two examples from [industry] | you have real references from that industry |
Follow-up email subject lines (8)
No. | Subject line | Use it when … |
|---|---|---|
11 | Re: [original subject] | you follow up in the same thread |
12 | Quick nudge on my question | your first email has gone unanswered for a few days |
13 | Still relevant: [topic]? | the recipient's situation may have changed |
14 | An example for my last email | you bring something new with the follow-up |
15 | Am I talking to the right person? | you suspect someone else owns the topic |
16 | Better to check back in [month]? | the timing may be off |
17 | One more thought on [topic] | your first email missed a point |
18 | Should I close this thread? | you follow up for the last time |
How often and how far apart to follow up is covered in detail in our follow-up email templates.
After a call or meeting (6)
No. | Subject line | Use it when … |
|---|---|---|
19 | Recap of our call on [date] | you want to capture the outcome |
20 | The documents from our call | you promised to send something |
21 | Times for our next step | a follow-up meeting needs scheduling |
22 | Proposal for [company], as discussed | the proposal is expected |
23 | The overview from our LinkedIn chat | your contact asked for the email in the chat |
24 | Open questions on [topic] after our call | something still needs clarifying |
Referrals and warm intros (5)
No. | Subject line | Use it when … |
|---|---|---|
25 | [Name] suggested we talk | the referrer actually said so |
26 | [Name] recommended I reach out about [topic] | the topic is new to the recipient |
27 | Intro: [your name] and [name] | the referrer makes the intro and copies you |
28 | Referred by [name] ([company]) | the recipient knows the referrer mainly through the company |
29 | [Name] pointed me to you | you were forwarded because of who owns the topic |
Only use the referrer's name if they agreed. That's not a formality: if the recipient checks, the referral has to hold up.
Recruiting: reaching out to candidates (6)
No. | Subject line | Use it when … |
|---|---|---|
30 | [Role] at [company]: a fit for you? | profile and role clearly match |
31 | Your experience with [technology] | one specific skill is the deciding factor |
32 | [Role] in [city], remote possible | location is a selling point |
33 | [Role] at [company], [salary range] | you're allowed to share the range |
34 | Your next step after [project]? | the person just wrapped up a project |
35 | Do you know someone for [role]? | the person isn't looking to move |
Job applications and speculative applications (5)
No. | Subject line | Use it when … |
|---|---|---|
36 | Application: [role], [your name] | you apply for an advertised role |
37 | Question about the [role] opening ([reference]) | you want to clarify something before applying |
38 | Speculative application, [field]: [your name] | there's no matching job ad |
39 | As discussed on LinkedIn: my CV | the person asked you for your documents |
40 | [Name] recommended me for [team] | someone inside the company refers you |
Subject line plus first sentence: two examples
This is how the two work together. The names are examples.
Subject: Your post on trade show leads
Hi Jana, your post about following up on trade show leads made me think, especially the point about business cards that sit in a drawer for weeks. How does [company] handle that these days?
Subject: Should I close this thread?
Hi Jana, I've written to you twice about [topic] and haven't heard back, which is completely fine. If it fits later, just reply to this email. Otherwise I won't write about this again.
Subject lines on LinkedIn: InMail yes, chat no
On LinkedIn, whether you get a subject line depends on how you write. InMails, messages to people you're not connected with, have a subject field. LinkedIn's instructions call it optional and allow up to 200 characters. Source: LinkedIn Help: Send an InMail message, retrieved 28 September 2026. In Sales Navigator, LinkedIn tells you to add a subject line of up to 200 characters when composing an InMail. Source: Sales Navigator Help: Compose an InMail message, retrieved 28 September 2026. In Sales Navigator the subject line is required, as our knowledge base explains.
Messages to 1st-degree connections run as a chat. LinkedIn's steps for them only include a recipient field and a “Write a message” box, no subject. Source: LinkedIn Help: Send messages to connections on LinkedIn Messaging, retrieved 28 September 2026. In a chat, your first sentence has to do the subject line's job.
For InMails, the same rules apply as for email: short, specific, with a clear connection. Since an InMail conversation only really starts once someone replies, a subject line that promises a simple question works well. A question like “Am I right that you work in [industry]?” is easy to answer with a yes or no, and any answer opens the chat.
How CompLeadly helps
CompLeadly is a desktop app for Windows and macOS that runs on your own computer over your own IP. For subject lines, three features matter.
- Auto Email (Premium and up): CompLeadly sends emails to an imported target audience through your own email connection (SMTP server, sender address and your provider's credentials). You enter subject and body, personalize with placeholders, attach files if needed and check the result in the email preview first. Optionally, a blind copy goes to your CRM. The setup is explained step by step in our knowledge base.
- InMails with a subject line: In the InMail feature you set subject and message, use placeholders and choose a daily limit. With “only send to Open Profiles”, InMails go exclusively to Open Profiles, which you can reach for free. The InMail reply collector sorts replied, declined and unanswered InMails into target audiences, so you can follow up with each group on purpose.
- Message check: Our free message check reviews the text of your message for length, personal connection, an open question and promotional language, right in your browser and without signing up. It doesn't grade the subject line, but it does grade the first sentence that has to deliver on it.
LinkedIn replies land in one inbox, the Smart Chat. The cleanest way to combine LinkedIn and email is to talk on LinkedIn first and send the email once your contact agrees, which is exactly what subject line no. 23 is for. If you don't have an address yet, our guide to finding email addresses covers the options.
After the 10-day trial with all features, you can keep using CompLeadly for free with the basic features and daily limits, for example 2 connection requests, 1 opener and 1 follow-up per day, each step started individually; full workflows start with Basic. Auto Email isn't part of the free plan. All plans are on the pricing page.
Recruiting and job hunting: same rules, different sender
The recruiting and application examples above already show it: a good subject line works in recruiting just like in sales. For candidates, the subject should carry the role, the location and a real link to their profile. “Exciting career opportunity” says none of that. In recruiting, you build your target audience in CompLeadly from a LinkedIn people search, a Sales Navigator search or, with Recruiter access, from Recruiter searches, and reach candidates by InMail with a subject line or, after connecting, with an opener. More on the recruiters page and in our LinkedIn recruiting message templates. As a job seeker, the same holds in reverse: the subject line names the role and your name, and the email goes to the person you've already talked to on LinkedIn. In CompLeadly you create an audience for this from a people search, for example team leads at your target employer, connect with a note and send an opener once they accept. On the free plan that is 2 connection requests and 1 opener per day, enough for a short, focused list. Common pitfalls are covered in 10 common LinkedIn mistakes when job hunting.
FAQ
How long should a cold email subject line be?
As a rule of thumb, 40 to 60 characters. There's no fixed limit for email, but many mail apps shorten long subject lines in the preview. Put the connection first so it stays visible.
What should I write in a cold email subject line?
A specific link to the recipient plus the topic, for example “Question about your sales push in Austria”. No sales words, no capital letters, no “Re:” without a previous email.
Should I change the subject line for a follow-up email?
If you follow up in the same thread, keep the original subject with “Re:”. If you bring something new, such as an example, a fresh subject like “An example for my last email” can fit better.
Do LinkedIn messages have a subject line?
InMails have a subject field of up to 200 characters; on LinkedIn it's optional, in Sales Navigator it's required. Messages to 1st-degree connections are chats without a subject.
Should I use the recipient's first name in the subject line?
Only when it adds something. A specific topic or occasion shows more personalization than a first name that any mail merge can insert.
