When someone subscribes, they're raising their hand. They're not ready to buy yet — they're trying to understand what they signed up for and whether it was worth it. That's what the welcome email is doing.
When it doesn't show up, a few things happen at once: there's no confirmation they're in the right place, no context for what kind of emails they'll receive, and no reason to open the next message when it arrives.
So instead of building trust, the relationship just stalls. Most subscribers don't think "this brand forgot about me." They just move on. And when your next campaign shows up days later, it feels random instead of expected.
That's why welcome emails aren't about storytelling or clever introductions. They're about orientation — why you're emailing them, what they'll get from staying subscribed, what to expect next.
When that's clear, engagement starts on stable ground. When it's missing, every email after that has to work harder than it should.