ExchangeDefender SPF policy authorizations experienced errors earlier today, you may have received error such as:
Email rejected: 550 65.99.255.36 is not allowed to send mail from yourdomain.com.
This issue was caused by a network translation (proxying) of outbound mail and in some instances the calls went direct instead of authorized path.
This issue has since been corrected and you should not be experiencing any problems sending email. If problems with sending email persist please open a support ticket and send an email from the affected user to postmaster@exchangedefender.net (reference tracking if possible) and we will look at it as it may be unrelated to our event.