Email verification is typically a tiered process that goes through several steps to ensure your email lists are valid. After these basic steps, some platforms also offer additional insights into your data, including removing bad-fit buyers or identifying buying signals.
Scrubbing spam traps
Checking for formatting and syntax errors
Reviewing DNS records for correct domain name
Ensuring a domain exchange server can actually receive emails
Using the SMTP protocol to check the mailbox
Some platforms offer even more steps with eight or nine total verification methods.