EmailListVerify is a reputable email validation company. They are popular to manage and validate substantial email lists and have an accuracy of 90%. They offer two different options; pay as you go or a monthly subscription plan for creating frequent campaigns depending on your requirements.
Also, EmailListVerify provides free tools like an email health checker to your DNS, blacklist checker, email extractor, and MX lookup. They can verify 100K emails at $169, while NeverBounce and Clearout verify 100K emails at $400 and $350, respectively.
Using real-time verification with API can be a great choice to validate forms at entry levels and smooth your database for creating campaigns. In contrast, they fall behind in the automation of email list cleaning.
You may be overwhelmed with the features provided by EmailListVerify. However, they are an excellent company to verify large lists but still quite lacking in verification accuracy.