Let me describe a database constraint that cost me over 200 technically sophisticated customers. Users who understood plus-sign aliases couldn't sign up at all. I never knew they were trying.
My British IPTV signups from tech-savvy customers were suspiciously low. I assumed tech people weren't interested in my service. I was completely wrong. They were very interested. They were blocked silently. My database accepted "[email protected]" but rejected "[email protected]". Two plus signs. Perfectly valid. My database rejected it.
Here's the thing — multiple plus-sign constraints are invisible. Your British IPTV business loses the most technically sophisticated customers. The ones who understand email aliases. The ones who value privacy. The ones who refer other tech-savvy friends.
In most cases, resellers never find multiple plus-sign constraints. They assume tech people aren't interested. They lose their best potential referrers.
What actually works is testing signups with email addresses containing multiple plus signs. Test with two. Test with three. Test with five. Every valid email format must be accepted.
One real-world scenario: a reseller in Manchester found the constraint. He fixed it. Tech-savvy signups appeared immediately.
The pattern that keeps showing up is that complex plus-sign constraints are invisible. Your British IPTV business needs complex email testing.
The 4 AM database constraint taught me that tech users use complex aliases. Accept them all.
A loose sentence: A database constraint that blocks multiple plus signs blocks your most sophisticated potential customers. Test your signups with complex email aliases today