Send an email from your real corporate mailbox and TagThat will verify the message using SPF, DKIM, and DMARC. If it passes, TagThat creates or joins your workspace and sends back a one-time magic login link.
Send to: join@tagthat.com
From: your corporate mailbox, like name@company.com
Validation: TagThat requires SPF pass, DKIM pass, and DMARC pass/alignment on the inbound message.
Result: if valid, TagThat creates or joins your domain workspace and emails you a one-time login link that expires quickly.
Delivery note: the magic link still depends on successful outbound mail delivery. If the receiving server refuses mail or Resend cannot complete delivery, no magic link will arrive even if signup validation succeeded.
If the inbound mail does not authenticate correctly, signup is rejected and no login link is issued.