Spam Emails
I do not send unsolicited emails of any sort.
Whilst I have enabled all available anti-spam server options (e.g. SPF) unfortunately there is little else I (nor anyone) can do to prevent the sending of these emails from other servers who have not enabled these protocols.
It is certainly annoying for all involved (I get the bounced emails every day), so if appropriate please feel free to block my email or domain.