I understand, it's on one niche and all emails are for hotel managers which mean if i have only 10k true mails it's a good usse for me, thank you for your advice.
the email list is from all my companies costumers over years, but when i did the DNS check i found out that most of them change their namedomains or something, so i need to make sure that at least how many delivered emails or open the emails to avoid problems with sendgrid.
Hello, i have an email list contain 150.000 email and a sendgrid account, after I did my DNS CHECKING I found only 29.000 email valid, now i need a to see if this 29k emails really valid, I need a technique that I will send emails free and see if who opened and who bounced and delivered before...
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