Removing entries from newsletter archive is only possible if the newsletter archive is configured and one or more emails are sent. To remove entries from archive you must click on "Remove entries from newsletter archive..." to see all entries.
Hints
Removing years
On the list you must select a year after than click at button "Remove Year" to remove the year and the newsletter archive entries for this year. After than you can click on "Recall Year" to undelete the year an newsletter archive entries.
To remove the year and newsletter archive entries permanently you must click on button "Save".
Remove single entries
On the email list select the entry which should be deleted. Click at button "Remove entry" to remove the entry. You can click on "Recall entry" to undo this action.
To remove the newsletter archive entries permanently you must click on button "Save".
See also
Setting up newsletter archive