Is it Wordpress/article sites, forums and blog comments you have submitted to?
There are few of these you can actually post to or even get the account approved. You can increase success rate by using good and relevant email addresses. Using @mail.ru when posting on ES or FR sites for example won't pass a human administrator. Same applies to proxies. Another point is the default SER footprints in blog comments and profiles. Adapt these to match your project and avoid the default footprints by all means.
Comments
a lot of unactivated, unconfirmed emails are accumulating
There are few of these you can actually post to or even get the account approved. You can increase success rate by using good and relevant email addresses. Using @mail.ru when posting on ES or FR sites for example won't pass a human administrator. Same applies to proxies. Another point is the default SER footprints in blog comments and profiles. Adapt these to match your project and avoid the default footprints by all means.