On which page can this be checked and IP removed ? And more important if some email headers can be provided to also check our logs ?
550-Sophos Anti Spam Engine has blocked this Email because the sender IP550 Address is blacklisted.
Thank you for contacting the Sophos Community!
To request a delisting, follow the steps in the following URL https://www.sophos.com/en-us/support/ip-address-lookup