I'll post the error (minus your personal info) from the last bounce report (which was in August 2014):

said: 554 5.7.1 Mail
(id-40710-04073) appears to be unsolicited, please resend with the code
u1eturu1 appended to email subject and ask to have your sender email
whitelisted (the code u1eturu1 changes each 24 hours). (in reply to end of
DATA command)
As you might recall, I have had to jump through this hoop and ask you to whitelist the sender a number of times. When the issue keeps re-occurring anyway, there comes a point where I feel I've done enough on my end.