This is the list of verifications we do:
Valid format : First, we verify if the format of every email address is correct. The syntax of valid email address should look like "firstname.lastname@example.org".
● Invalid Email Address : We scan and filter redundant email addresses. For example, email@example.com doesn't pass the test.
● Disposable Email Address : We check if the email address includes domain name used for temporary email addresses.
● Web Email Address : We verify if the email address uses a webmail like Gmail or Yahoo.
● Presence of MX Records : We check if there are MX records on the domain. If no records are found, the email address can't receive emails.
● Presence of SMTP Server : This check is successful if we are able to connect to the SMTP server (indicated in MX records).
● SMTP Check : We test the email address for successful delivery of messages.
● Accept-all Domain : We check if the server has a catch-all policy, which accepts all the email addresses.
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