Fixing Zoho CRM Emails That Recipients Don't Receive

Issue sending emails from Zoho CRM - recipiant doesn't recieve email

If emails sent from Zoho CRM aren't reaching a recipient, one of the most common causes is the recipient's mail server rejecting or quarantining the message because it looks spoofed. Zoho CRM sends the email showing your own address as the sender, but the message technically originates from Zoho's servers, and mail servers with strict anti-spoofing policies can flag that mismatch.

The fix: authenticate your sending domain

Setting up DKIM, and ideally SPF, for your domain tells receiving mail servers that Zoho is genuinely authorised to send email on your behalf, which resolves the majority of these delivery issues, including with Microsoft 365 and Outlook recipients, who apply particularly strict checks. See our article on setting up email authentication in Zoho CRM for the full setup steps.

Note on Microsoft 365 specifically: Microsoft applies an additional check called composite authentication. Even when SPF technically passes, Microsoft may still reject or spam the message unless DKIM is properly aligned to your visible From domain. A correctly configured DKIM record, set up through Email Deliverability, is usually what resolves persistent Outlook or Microsoft 365 delivery problems specifically.

Common setup mistakes worth checking

  • Two SPF records. A domain can only have one SPF TXT record. If someone previously added a separate one, and Zoho's include was added to a different, newer record, having two active SPF records is a permanent failure that breaks SPF entirely, not just for Zoho.
  • Too many SPF lookups. SPF allows a maximum of 10 DNS lookups per check. Domains using several services, such as Zoho, Microsoft 365, a helpdesk, and marketing tools, can exceed this limit without anyone noticing, which also causes SPF to fail.

Testing whether it's fixed

Send a test email from Zoho CRM to a mailbox you control, then view the message's original source and check the Authentication-Results header for SPF, DKIM, and DMARC results. Sending a test to a service like mail-tester.com can also give you a quick, readable score and flag any remaining issues.

Need help? 1 Cloud Consultants can help you diagnose email deliverability issues from Zoho CRM, and fix SPF, DKIM, and DMARC configuration problems at the DNS level. Book a discovery call with 1 Cloud Consultants.