How to Write Email Subjects That Get Opened

Email subject lines are the gateway to your emails being opened. To get your prospects to open your emails, your subject line must quickly communicate value, relevance, and spark enough interest or urgency. This article covers why crafting effective email subjects is important, a step-by-step guide to writing them, a detailed example using a US business with USD figures, common mistakes to avoid, and how HelloGrowthCRM can help automate your email follow-ups.

Why this comes up / what goes wrong

Small-business owners in the US often face low email open rates that reduce leads and sales. They send quotes, offers, or follow-ups but get few responses. This usually happens because subject lines are too generic, vague, or too long, failing to convey a clear reason to open. For example, subjects like "Hello" or "Check this out" get lost in busy inboxes. Without effective subject lines, emails remain unopened, leads go cold, and opportunities are missed. Improving your email subjects is essential to increase engagement and sales.

Step-by-step

1. Know your audience: Understand what your prospect cares about—price, speed, quality, or expertise. Tailor your subject line to that.

1. Use personalization: Include the recipient’s name or company if possible. For example, "John, your plumbing quote inside" feels direct and personal.

1. Keep it concise: Aim for 30-50 characters. Mobile devices often cut off longer subjects, so short subjects perform better.

1. Create curiosity or urgency: Use phrases like "Limited time offer" or "Can we schedule your service?" to encourage opening.

1. State the benefit or reason clearly: "Save 10% on your next repair" tells the recipient what’s in it for them.

1. Avoid spammy words: Words like "Free," "Buy now," or excessive punctuation can trigger spam filters and reduce opens.

1. Test different subjects: Use A/B testing in your email tool to see which subjects get better open rates.

1. Check spelling and grammar: Errors reduce your credibility and may discourage opens.

1. Match subject with email content: Don’t mislead recipients; ensure the subject line reflects the email’s message.

1. Use sequences and follow-ups: If the first email isn’t opened, a well-timed follow-up with a different subject can help (see email automation and sequences).

Example (fictional figures)

A plumbing company in Austin, Texas wants to increase quote requests by improving email open rates. They send 1,000 emails with this subject:

"John, your plumbing quote inside"

Their usual open rate is 15%, so the number of opens is:

1,000 × 15% = 150 opens

They change the subject to:

"John, save 10% on your Austin plumbing repair"

The open rate improves to 25%, so the number of opens is:

1,000 × 25% = 250 opens

The increase in opens is:

250 opens - 150 opens = 100 more opens

This means 100 more potential customers open the email, improving the chances of converting leads into sales.

Common mistakes

• Too vague or generic subjects: Prevent by clearly stating a benefit or reason to open.
• Overly long subjects: Prevent by keeping subjects under 50 characters for full visibility, especially on mobile.
• Using all caps or excessive punctuation: Prevent by writing naturally to avoid looking like spam.
• Ignoring mobile view: Prevent by testing your subject lines on phones to see how they appear.
• Not following up: Prevent by setting automated sequences and campaigns to send follow-ups (email automation and sequences).
• Mismatch between subject and content: Prevent by ensuring your email content delivers on the promise made in the subject.

Doing this in HelloGrowthCRM

HelloGrowthCRM offers HelloMail, a shared inbox inside the CRM that lets your whole team see replies to quotation emails on the deal, so no lead is missed. You can also set up sequences and campaigns to automate a five-step follow-up over two weeks that runs automatically and stops as soon as a prospect replies. This keeps your outreach consistent without manual work. Learn more about these features at email automation and sequences.

Frequently asked questions

What length should an email subject be? Aim for 30-50 characters to ensure it displays fully on most devices, especially mobiles. (twilio.com)

How important is personalization in subject lines? Personalization helps because it makes the email feel relevant and direct to the recipient, increasing open rates.

Can I use emojis in email subjects? Emojis can attract attention but use them sparingly and only if appropriate for your audience and brand tone.

How often should I send follow-up emails? A sequence over two weeks with about five steps is effective; adjust timing based on recipient response.

What should I avoid in email subjects? Avoid spammy words, all caps, excessive punctuation, and misleading promises to maintain trust and avoid spam filters.

How can I test which subject lines work best? Use A/B testing features in your email tool to compare open rates of different subject lines and find what works best.

Can I manage email follow-ups and replies with HelloGrowthCRM? Yes, HelloGrowthCRM’s HelloMail shared inbox keeps your team informed of replies, and automated sequences handle follow-ups efficiently.

Key takeaways

• Clear, concise, and personalized subjects get more opens.
• Use urgency or curiosity without sounding spammy.
• Test different subjects with A/B testing to find what works.
• Follow up with automated sequences to engage unresponsive leads.
• Align subject line with email content to build trust and avoid disappointment.
• Use tools like HelloGrowthCRM to automate and track email outreach.

Start improving your email open rates today. Start on the Free Forever plan (200 leads, no credit card) with HelloGrowthCRM to manage email sequences and follow-ups efficiently.