Thank you for your email, and for letting us know about this blacklisting.
Your case reference is VOL011-38504XXXXX.
Unfortunately this can happen every so often if one of our customers has abused the service in some way, and caused our email server to be blacklisted.
Could you forward the error email to our Abuse team at [email protected], so that they can contact the relevant organisation to have the block lifted?
Thank you for your assistance, and if you have any further problems or queries then please let us know.
If in the future you need further assistance please feel free to search the knowledge base or email our BT Business Support team again at www.btbusinessoffice.com/help.