How to End a Cold Email: 10 Sign-Offs That Actually Get Replies

Your email subject line gets the open. Your first line keeps them reading. But your closing line determines whether they actually reply. And yet most cold email guides spend 90% of their word count on openers and subject lines and treat the sign-off as an afterthought.

That is a mistake. Boomerang analyzed 350,000 email threads and found that the way you end an email affects response rates by up to 36%. Emails ending with "thanks in advance" saw a 65.7% response rate, against 51.2% for emails ending with just a name and title. Read those absolute numbers for what they are: Boomerang's sample is ordinary business email, much of it already warm, and cold outreach operates an order of magnitude below it. Our cold email reply rate benchmarks, built from more than 850 million emails sent through Smartlead, put the median cold sender at a 0.74% reply rate one reply per 135 contacts with the top 10% at 2.63% and the top 5% at 3.85%.

What carries over is the relative gap, and at cold email volume it compounds. Boomerang's best sign-off pulled roughly 28% more responses than its worst. Applied to a median cold sender, that moves 0.74% to about 0.95% 95 replies per 10,000 contacts instead of 74. For a team running 100,000 contacts a quarter, that is 210 extra conversations from a one-line change, before anyone touches the offer or the list.

This guide covers 10 proven sign-offs with response rate data, explains why certain closings work better than others, and shows you how to test them systematically. Every recommendation is backed by published research from Boomerang, Woodpecker, and Yesware, with cold email baselines from Smartlead's own platform data.

Why does your email closing line matter so much?

The closing line is the last thing a prospect reads before deciding whether to reply, delete, or save for later. Psychologically, it carries disproportionate weight because of the recency effect. People remember the last thing they read more vividly than anything in the middle.

Boomerang's data (350,000 threads) shows a clear hierarchy. Gratitude-based closings outperform everything else by a significant margin. The theory: saying "thanks in advance" implies you expect a response, which creates a subtle social obligation. It is polite but presumptive, and that combination drives action.

"We tested six different closings across 50,000 emails on Smartlead," shared one agency owner on G2. "The 'thanks in advance' variant beat every other closing by at least 8 percentage points. It was the easiest win we found."

What are the 10 best ways to end a cold email?

Here are 10 sign-offs ranked by effectiveness, based on Boomerang, Woodpecker, and Yesware data. Each one works for different contexts.

1. "Thanks in advance, [Name]"
   Response rate: 65.7%. Best for: any cold email where you are asking for something specific. The gratitude framing implies the prospect is already going to help.
2. "Appreciate your time, [Name]"
   Response rate: 63.4%. Best for: emails to busy executives. Acknowledges their time constraint without being needy.
3. "Looking forward to your thoughts"
   Response rate: 62.1%. Best for: emails that share a data point or insight. Invites a reply without a specific ask.
4. "Would [day] at [time] work for a quick call?"
   Response rate: 59.3%. Best for: emails where the goal is a meeting. Specific time proposals convert 2.1x better than open-ended "let me know when you are free" (Yesware, 2025).
5. "Happy to share more if this is relevant"
   Response rate: 58.7%. Best for: emails that introduce a concept. Low pressure, high optionality.
6. "Let me know if this is worth exploring"
   Response rate: 57.2%. Best for: enterprise outreach where the prospect needs to evaluate fit. Gives them permission to say no, which paradoxically increases replies.
7. "Cheers, [Name]"
   Response rate: 54.8%. Best for: casual industries (tech, startups, agencies). Less effective in formal industries (finance, legal, healthcare).
8. "Talk soon, [Name]"
   Response rate: 53.1%. Best for: follow-up emails where you have already established initial contact.
9. "Best, [Name]"
   Response rate: 51.2%. The baseline. Not bad, but not optimized. Most cold emailers default to this without testing alternatives.
10. "Sent from Smartlead"
    (Not a real recommendation. But if your team sends from Smartlead, your follow-up sequences fire automatically, so even a mediocre closing gets a second chance.

Use Smartlead's multi-variant testing to run A/B tests on your closing lines. Set up two or three variants per campaign and let the platform rotate them across your prospect list. With enough volume, you will find the closing that works best for your specific audience.

How do you write a closing CTA that converts?

The closing CTA is different from the sign-off. The CTA is your ask. The sign-off is your farewell. They work together but serve different functions.

Effective cold email CTAs share three traits:

• Specific: "Can we talk Tuesday at 3 PM?" beats "Can we chat sometime?" Yesware's 2025 data shows specific time proposals get 2.1x more replies than open-ended asks.
• Low-friction: "Worth a 15-minute call?" beats "Can we schedule a 60-minute demo?" The smaller the ask, the higher the conversion. Woodpecker found that asks under 15 minutes convert 3.4x better than asks over 30 minutes.
• Binary: "Is this relevant for you?" beats "What do you think about our platform?" Yes/no questions are easier to answer than open-ended ones, and easier answers mean more replies.

Here is the anatomy of a high-converting closing:

[One-sentence value reminder] + [Specific, low-friction CTA] + [Gratitude sign-off]

Example: "We helped [similar company] increase reply rates by 34% in 60 days. Worth a 15-minute call Tuesday afternoon to see if the same approach fits [company name]? Thanks in advance."

On Smartlead, SmartAgents can generate personalized closing CTAs at scale by pulling company-specific data from SmartProspect. Instead of writing one generic CTA for 5,000 prospects, you get 5,000 CTAs that reference each prospect's specific situation.

Which closings should you avoid in cold emails?

Some closings actively hurt your reply rates. Avoid these:

• Please let me know if you have any questions: Passive and generic. It puts the burden on the prospect to think of questions. Woodpecker's data shows this closing underperforms the average by 12%.
• I look forward to hearing from you soon: Pushy without providing value. The "soon" creates pressure without earning it.
• Do not hesitate to reach out: Formal, stiff, and adds nothing. Nobody was hesitating. They just were not interested enough.
• Regards, [Name] or Sincerely, [Name]: These read as formal correspondence, not conversation. In cold email, conversational tone wins. Yesware found that informal closings outperform formal ones by 22% in B2B outreach.
• No closing at all: Emails that end abruptly (no sign-off, no CTA) see a 47.8% response rate vs 65.7% for gratitude closings. That is an 18-point gap from simply not writing two words.

"We had a rep who ended every email with 'Regards' and his reply rate was 40% below team average," shared one Smartlead user on G2. "We switched him to 'Thanks in advance' and his rate jumped 11% in a week. The content was identical."

How do you A/B test email closings at scale?

Testing email closings requires three things: enough volume, controlled variables, and a platform that handles variant rotation automatically.

Here is the testing framework:

• Minimum sample size: 200 sends per variant. Below 200, the results are not statistically significant (Woodpecker, 2025).
• Control one variable at a time: Only change the closing. Keep subject line, first line, body, and CTA identical. Otherwise you cannot attribute results to the closing.
• Run for at least 5 business days: Reply patterns differ by day of week. A test that only runs Monday through Wednesday misses Thursday and Friday reply behavior.
• Measure reply rate, not open rate: The closing does not affect opens. It affects replies. Track the metric that matters.

On Smartlead, set up multi-variant campaigns with different closing lines. The platform automatically rotates variants, tracks reply rates per variant, and identifies the winner. You can run three to five variants simultaneously across unlimited mailboxes with proper warmup and deliverability testing.

One testing insight worth knowing: closings that work for email one in a sequence often differ from closings that work for email three or four. First emails benefit from gratitude closings. Later follow-ups benefit from question-based closings ("Did this land at a bad time?") that acknowledge the silence and invite a quick response.

What closing works best for different industries?

Industry matters more than most generic email advice acknowledges. The best ways to end an email professionally vary by who you are emailing.

• SaaS/Tech: Casual closings win. "Cheers," "Talk soon," and first-name-only sign-offs. This audience distrusts formality because it signals a template. Personalized, conversational closings see 18% higher reply rates in tech (Woodpecker, 2025).
• Financial services: Professional closings with clear CTAs. "Would a 15-minute call next week make sense? Thanks, [Name]." Avoid anything too casual. Compliance teams screenshot cold emails.
• Agencies: Peer-to-peer closings. "Happy to trade notes on this" or "Would love to hear how you are handling [challenge]." Agency owners respond to equals, not salespeople.
• Healthcare: Formal but warm. "Appreciate your time, [Name]." Avoid urgency language. Healthcare buyers have long decision cycles and resent being rushed.
• Real estate: Direct CTAs with specific value. "I found 3 listings that match your criteria. Worth a 5-minute walkthrough? Thanks, [Name]."

Smartlead's SmartAgents can adapt closing language based on industry tags in your prospect data. Tag your lists by vertical, create industry-specific closing variants, and let the platform match the right closing to the right audience automatically.

How do you combine a strong closing with an effective follow-up sequence?

The closing of email one sets up email two. If your first email ends with a specific question ("Would Tuesday work?"), your follow-up can reference the unanswered question ("Following up on my Tuesday suggestion"). If your first email ends with an open offer ("Happy to share more"), your follow-up can deliver on that offer ("Here is the case study I mentioned").

The sequence logic:

• Email 1 closing: Gratitude + specific CTA. "Thanks in advance. Would Wednesday at 2 PM work for a 15-minute call?"
• Email 2 closing (3 days later): Reference + softer ask. "Just bumping this up. If Wednesday doesn't work, I'm flexible. When's better?"
• Email 3 closing (5 days later): Value add + question. "I put together a quick analysis of [their company's] outbound performance. Worth a look? Appreciate your time."
• Email 4 closing (7 days later): Permission-based exit. "If the timing is off, totally understand. Just let me know and I will check back in Q3."

Smartlead's 2026 , built from 850M+ emails, show the first email earns a reply every 85 contacts while the seventh needs 303. The closing of each email matters because it determines whether the prospect stays engaged through the full sequence or tunes out after email one.

Smartlead automates this entire sequence with conditional logic. If a prospect replies at any step, the sequence pauses and their reply lands in the Master Inbox. If they don't reply, the next email fires automatically with a different closing angle. The outbound operating system handles the orchestration so your reps focus on conversations, not scheduling.

Frequently Asked Questions

1.What is the best way to end a cold email?

Gratitude-based closings like "Thanks in advance" achieve the highest response rates at 65.7%, according to Boomerang's analysis of 350,000 email threads. Combine a gratitude sign-off with a specific, low-friction CTA (like a 15-minute call at a specific time) for maximum effect. Avoid generic closings like "Regards" or "Please let me know if you have any questions."

2. Does the email sign-off actually affect reply rates?

Yes, significantly. Boomerang's data shows a 36% gap between the best-performing sign-off (gratitude-based, 65.7%) and no sign-off at all (47.8%). That gap translates to hundreds of additional replies per month for teams sending at volume. The sign-off is the last impression before the reply decision.

3. How many words should a cold email closing be?

Keep the closing CTA plus sign-off under 25 words. The CTA should be one sentence, the sign-off should be two to four words. Example: "Worth a 15-minute call Tuesday? Thanks in advance, [Name]." That is 12 words. Woodpecker's 2025 data shows that closings over 40 words reduce reply rates by 8%.

4. Should I use "Best regards" or "Cheers" in cold emails?

It depends on your industry. "Cheers" outperforms "Best regards" by 3.6 percentage points in tech and startup outreach (Yesware, 2025). In financial services and healthcare, "Best regards" performs better because the audience expects formality. Test both with Smartlead's multi-variant campaigns to find what works for your specific audience.

5. How do I end a follow-up cold email differently from the first email?

First emails benefit from gratitude closings ("Thanks in advance"). Follow-up emails perform better with question-based closings ("Did this land at a bad time?" or "Is this still relevant?"). The question acknowledges the silence and makes replying easy. Each email in your sequence should use a different closing angle to avoid feeling repetitive.