cold email subject lines
Six patterns beat two hundred templates.
A swipe file of subject lines is useless without the reasoning, because the line has to match your segment and your ask. Here are six patterns that work in B2B cold email, why each one works, and the ones that got burned out by overuse.
The rules before the patterns
Under 45 characters. Lowercase-ish. No emojis, no all-caps, no exclamation marks. Describe the email, don't sell it — the subject line's only job is to get the first sentence read, and overselling here makes the body a letdown. If your subject would look at home in a newsletter, rewrite it as something a colleague might send.
Six patterns worth using
The plain topic — 'scheduling at two studios'
Names the thing the email is about, in their vocabulary. Boring on purpose. This is the highest-floor pattern and the hardest to get wrong.
The specific question — 'who owns rescheduling there?'
Works because it's answerable in one line and implies a short exchange rather than a demo. Fails when it's rhetorical.
The observation — 'second location, same coordinator'
Uses one real signal about their company. Proves aim without flattery. Requires that the signal is actually true.
The referral or context — 'from the podcast ops thread'
Strongest available pattern, and only usable when honest. Never fake shared context; it destroys the reply and the account.
The direct offer — 'cutting no-shows for studios'
Sets expectations honestly, which lowers opens but raises reply quality. Good when your ICP is tight enough that the offer lands.
The pattern to avoid — 'Quick question' alone
Once effective, now the most overused cold subject in existence. Filters and humans both recognise it. If you use it, make it specific.
How to judge a subject line in ten seconds
Three questions, and a no on any of them means rewrite.
How fkngrow writes yours
Every drafted campaign includes a subject line generated from your own positioning and the segment you're targeting, constrained to stay short and plain rather than promotional. If it misses, add your context and regenerate — the model rewrites the subject and the body together, so the two stay consistent. Sends go out from your own connected Gmail on a daily cap, and the outreach log shows exactly which subject went to which prospect and when.
Subject line FAQ
What makes a good cold email subject line?
Specificity and low drama. Three to six words, lowercase-ish, describing what the email is actually about. If it could headline a marketing newsletter, it's wrong for cold outreach.
How long should a cold email subject line be?
Under about 45 characters so it isn't truncated on mobile. Shorter reads like internal mail, which is the effect you want.
Should I use the recipient's name or company in the subject?
Company sometimes, name rarely. A company name can add relevance, but a first name in a subject line is now a well-known bulk-mail tell and can hurt more than it helps.
Do emojis and questions help in subject lines?
Emojis reliably hurt in B2B cold email — they signal marketing. A plain question can work when it's specific to their situation rather than a rhetorical hook.
Does the subject line affect deliverability?
Indirectly and strongly. Spam-trigger phrasing, all-caps and excessive punctuation raise filtering risk, and low open rates over time train the provider to deprioritise you.
Should I A/B test subject lines?
Only once you have enough volume for the result to mean anything — a few hundred sends per variant. Below that you're reading noise, and your targeting is the higher-leverage thing to change.
Keep reading
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