Hi,

Office 365 provides an "Abuse" inbox where any outgoing emails it deems as spam / going into junk it puts a copy into so you can track and monitor your emails and check the contents to troubleshoot it.

Do you think you could implement a similar system so if Zoho deems the outgoing mail to be 'spammy' (bad links / phrases / attachments) a copy goes to this abuse folder for monitoring?