Every marketer who has run an e-mail or outreach campaign at least once, knows that e-mail marketing is a proven and precise marketing method, the best thing about it is metrics?—?every step of your e-mail campaign can be easily measured. The most well-known steps in every campaign are delivery rates, open rates, click-through rates and conversion rates. -- Why you should to verify your e-mail list:Save money on e-mail marketingIncrease the sender reputation, & conversion rate of your e-mails by sending them only to real people. Protect your domain reputation scoreSpam traps and hard bounces kill your reputation. Get rid of them so your e-mails don't end up in spam folders anymore. I will return you 2 files in excel format. First file will contain only "good e-mails" and the second one will contain all e-mails and error type for each one (valid/good, bad, timeout, antispam system, domain error, dead server, etc) (See the sample on above picture)