Newsletter unable to reach some members

Newsletter unable to reach some members who have "newsletter" box checked, while reached some other members who also had "newsletter" box checked.

Hi,

I took a look at your account and in the cases I saw, the email addresses were marked as invalid due to being bounced. Could you provide a specific CRM to help us investigate?

If a user requests to no longer receive email from you or if their email address is invalid - they will not receive your email newsletter.