Welcome emails subject lines

First-impression subject lines for new signups.

10 examples

1.You're in — here's the one thing to do first
2.Welcome — and a quick favor
3.Your first {{output}} is waiting
4.Confirmed — what to expect
5.Three things to know, then we'll write
6.One question before we get started
7.Skip the tour. Get to value.
8.Welcome to {{newsletter}}. Here's the deal.
9.{{founderName}}, with a quick hello
10.You signed up. Here's why that was a good move.

What makes these work

Welcome-email subject lines have one job: get opened. New subscribers have the highest open-rate cohort you'll ever have, but the subject line still matters because it sets tone for every email after. The subjects that win on welcome are direct and conversational — they read like a single person wrote them, not a marketing team. Avoid 'Welcome to {{brand}}' as a default; it's the lowest-effort pattern and signals templated. Better patterns: address what the user just did ('You're in — here's the one thing to do first'), set the deal of the relationship ('Three things you should know about us'), or open with the first useful insight ('Your first {{output}} is waiting'). For newsletters, asking a question in the subject line works well ('What's one decision you're trying to make this quarter?') — it primes the reply behavior that defines a healthy newsletter relationship. Avoid '{{firstName}}' interpolation in welcome subjects; the personalization is wasted and the missing-data fallback is awkward.