Mail to paypal and my Vet suppliers (amongst others) are refused with the following message:
"Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means."
On investigation my IP appears on 3 Spam lists (Barracuda, Rats Dyna and Spamhaus Zen)
How can I resolve this situation as my email is next to useless if I cannot rely on it.