
Only TBird messages bounced as spam by two correspondents
Hi TBird experts -
At my office with four users, we correspond with many companies using TBird in a Windows environment. We use our ISP's mail servers so our domain is @hawaiiantel.net. Every few weeks, one or two of our correspondents start bouncing our messages. The header is long but this is the important part:
Listed by CSS, see https://check.spamhaus.org/query/ip/64.98.42.38. -
https://community.mimecast.com/docs/DOC-1369#550 [bN0XCknkOUSxZxPgWtBa8A.usb39] (in reply to RCPT TO command)
We are showing up on a block list, obviously. It lasts a few days and stops. I didn't think TBird could have anything to do with it, but if I copy the body of my message, immediately open my Web Mail, create a message to the same recipient, and send it, it doesn't bounce. My co-workers are convinced this is a problem with TBird.
What are your thoughts? Many thanks in advance - JBusch223