Hello,
let me put this straight:
On decembre 11th I had 206 confirmed subscribers, but the mail was only sent to 201 of them.
On decembre 18th I had 229 confirmed subscribers, but the mail was only sent to 222 of them.
On decembre 25th I had 240 confirmed subscribers, but the mail was only sent to 234 of them.
I checked the bounce mails and did a spam check on my mails – no results. So quite frankly, I haven’t got a clue what could possibly be the problem.