Video transcript

1. 00:00Intro

   An email address can fail in three different places. Here is how to find out which one. Open the Validate Email Address page. Each check reports separately, so you can see exactly where an address breaks. There is no signup. The checks run in order. Format, then domain, then mailbox. Start with format. This address has no top-level domain.

2. 00:24Format failure

   Invalid syntax. It fails basic format checks, so it never reaches the mailbox. Fix the typo before you send. Next, a clean format on a domain that does not exist.

3. 00:36Domain failure

   Syntax passes. MX records fail. With no mail route, this domain cannot receive anything. So the check stops here. The mailbox was never asked, which is why SMTP and catch-all stay unresolved. Last, a real domain with a working mail route.

4. 00:52Mailbox layer

   Format passes. MX passes. SMTP passes. Then the last flag appears. Catch-all. This domain accepts mail for any address. So even a pass here cannot prove the mailbox is real.

5. 01:05What to do next

   When an address fails, look at where it failed. Fix a format error. Remove a dead domain. Review a catch-all. 20 free credits every day you use your account, up to 600 a month. No credit card required. Start at billionverify.com.

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