Survey invitation deliverability check

What each record does

• SPF lists which servers may send for your domain. Missing or broken SPF is the most common reason invitations are marked as suspicious.
• DKIM signs each message so the receiver can prove it wasn't altered and really came from you.
• DMARC tells mailbox providers what to do when SPF and DKIM don't line up, and sends you reports on who is sending as your domain.
• MX shows where your replies land. It's worth confirming that replies to invitations reach a monitored mailbox, not a black hole.

This tool reads public DNS only. It doesn't send mail, doesn't store the domain you enter, and can't see inbox placement, which no external tool can measure from outside. Gmail and Yahoo require SPF, DKIM and DMARC for bulk senders, so these three are the floor, not the finish line.

Reading the result

A clean pass means your paperwork is in order. It does not mean your invitations are being seen. Strategic Vision had about half of their invitations failing to reach the people they wanted to reach, and the fix was in how the sending was run, not in a DNS record.