Server thinks I am sending spam?

[darrenings]

Sent and email, received a reply, sent a reply back and suddenly I get an error from my iPhone client that “can’t send message due to possible Spam detected by the server”

I have tried checking “submission logs” for my domain on rollernet but I don’t see an entry. I have just tried to add whitelist for the domain I am sending too but get the same error.

The “server” it refers to, is this the rollernet smtpauth mail server or the destination mail server?

Any advice please what to do?
Thanks

[darrenings]

Actually, I just tried sending email to myself and I get the same issue with SPAM error. What’s happened/changed?
I cannot now send any email

[Seth]

We are seeing an error message that your IP is listed on the Spamhaus eXploits Blocklist (XBL) for malware and/or a botnet C&C server.

The Spamhaus link will be in the error message, but if your mail client doesn't show errors from the server we can email it to you.