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Bulk or batch cleaning: This type of validation is best for marketing professionals who have many existing email addresses that have never been validated.While this method may reject many addresses, it can increase the quality of the email addresses in a mailing list. Most real-time validation checks only look for syntax errors. Real-time validation: Many email validation services provide an API that checks an email address for the correct syntax when the email address is entered on a website.The downside is that if an incorrect address is entered, that person won’t receive the confirmation email. When the person receives the confirmation email, they click a link in the message to confirm their email address and that they want to be included in future mailings. Double opt-in: This type of validation sends a confirmation email to the person who signs up for a newsletter or enters their address in a website form.A syntax check also doesn’t look for inactive or non-existent domains and user accounts. Still, it has limitations because it identifies addresses with special characters as invalid. This is the simplest type of validation check. Syntax check: A syntax check looks at the email address and determines whether it is in the correct format.When evaluating an email validation service, look at which of these options is best for your mailing lists and choose the service that offers the type of validation that meets your needs. There are several ways to validate email addresses. These services may also search your mailing list for role-based and disposable addresses, look for spam traps, and determine if an IP address or domain name has been found in the body of spam email messages. Most services verify the validity of an address by looking at the address syntax and the DNS entries of the address. These services automate the verification process by performing a number of checks automatically. The quickest and easiest way to validate email addresses is to use a validation service. When you validate your mailing lists, you have a better chance of reaching your target market because your campaigns will be sent to valid and active email addresses. It can also identify spam traps that hurt your sender reputation. Email address validation identifies invalid addresses that can increase your bounce rate.