We are getting alot of errors from both services.

Emails to Hotmail users are bouncing back with notices like this one:
SMTP error from remote mailer after RCPT TO:<USER@hotmail.com>:
host mx4.hotmail.com [65.54.190.230]: 550 Requested action not taken:
mailbox unavailable

While emails of the magazine itself to Yahoo users bounced back with this message:
Sorry your message to USER@yahoo.com (USER@yahoo.com) cannot be delivered because it is too large.

Please note, we will continue to attempt to send the notices and magazine, but if you see the notice here, and the website is updated, but haven't gotten your email, it's most likely related to your email service.

We apologize for the inconvenience.

Just to add to this, Yahoo has increased it's online mailbox for it's user to 100Mb this last week. So if you have a Yahoo account and it was full it should not be now.