Email validation and deliverability testing are related, but they are not the same job.
What validation does
Validation focuses on the address itself. It helps answer questions like:
- Is the email formatted correctly?
- Does the domain appear able to receive mail?
- Is the address tied to a temporary or suspicious pattern?
- Does the address look risky because of a typo or similar issue?
MailCull sits in this part of the workflow. It helps you sort addresses into deliverable, risky, undeliverable, and unknown so you can make better send decisions.
What deliverability testing does
Deliverability testing is about the message after it is sent. It looks at your infrastructure and sending reputation, including:
- authentication setup
- domain reputation
- complaint patterns
- content issues
- inbox placement behavior
That is a different problem from deciding whether the list itself contains bad data.
How they work together
You can have:
- a clean list but weak inbox placement
- decent inbox placement but a dirty list that still produces bounces
The best workflow is usually:
- clean the list first
- make sure your domain authentication is set up
- diagnose inbox-placement issues only if problems remain
For many teams, list cleaning and basic sender hygiene solve the biggest preventable issues.