Sending works, nothing comes in, and no bounce shows up anywhere. That asymmetry tells you almost everything: inbound mail is decided by MX records, not by SPF. This guide walks the inbound path in the order a sending server actually walks it, groups the real causes into five DNS failure families, and gives you the dig commands to prove which one you are looking at.
Import mode fails quietly and Live Connect fails loudly. A practical breakdown of what each Zoho Analytics connection mode actually does, where each one wins, the four levers that should drive the choice, and a decision procedure you can run before you build the workspace.
You re-run the same extract for the same window and get a different set of rows. Nothing errored. You were paginating a result set that kept changing while you read it. Here's how to build a Zoho CRM to S3 pipeline whose runs are repeatable, from closed read windows to Bulk Read and deletions.