When a subscriber signs up through Leaky Paywall or another form on your site, we validate their email address to ensure it’s legitimate. If an email address bounces during the test, is not real, or has other incorrect mail settings, the email will be flagged and blocked from your newsletter list.
Here’s a look at what checks are being made:
Core Checks:
- Email syntax verification to ensure proper format with allowed characters, a prefix, @ sign, and domain
- Domain validation to confirm the domain exists and has published DNS records required for email delivery
- SMTP testing where they connect to the email server to confirm the address exists
Filtration Checks:
- Disposable email detection to identify temporary email providers
- Free email domain detection to identify known services like Gmail
- Role account detection to flag addresses like info@, admin@, or sales@ that may impact deliverability
- Duplicate removal when processing uploaded email lists
These validation steps protect your sending reputation. Without it, you risk high spam complaint rates and bounce rates that damage your domain’s deliverability reputation, making it harder for your emails to reach inboxes.
See this doc to learn how to add an email address to a list manually.