40% of our enterprise sales leads were disappearing before reaching sales reps.

In April, our inbound lead flow dropped from 120 qualified demos/month down to 70. Our marketing team insisted ad clicks were steady, but Sales complained their calendars were empty. We spent ten days rewriting our landing page copy and changing button colors.

We tracked the API payload path from the web form submission to our CRM. Results:

• Gmail / Yahoo leads: 97% sync success

• Outlook / Personal domains: 95% sync success

• Custom Corporate Webhooks: 91% sync success

• Form Submissions with plus-alias emails: 0% sync success

The email alias issue was the killer. Almost 40% of security-conscious enterprise IT directors and CTOs use sub-addressing (e.g., using a plus sign in their email address) when evaluating new software.

Root cause: Our lead-capture form had an overly strict Regex (Regular Expression) validation rule introduced during a frontend cleanup. It flagged any email containing a + symbol as invalid and silently discarded the form submission without showing an error to the user.

Fix took 1 hour: updated the email validation logic to support standard RFC email syntax. Demo bookings recovered to normal levels within 10 days.

How rigorously do you test your lead generation forms against complex or custom email formats?