If a meeting or event invite sent from Zoho CRM isn't reaching the recipient, this most commonly comes down to email authentication, particularly for invites going to external, non-Zoho email addresses.

The Most Likely Cause: Missing DKIM Authentication

If DKIM authentication hasn't been properly configured for your sending domain, some recipient mail servers will reject or silently drop calendar invites rather than delivering them, since they can't verify the invite genuinely came from a legitimate source. This tends to affect external recipients on non-Zoho email addresses more than internal Zoho-to-Zoho invites, which is a useful clue if your invites work fine internally but fail externally.

Other Reported Patterns Worth Checking

• Inconsistent delivery across multiple invitees. Some users have reported that when an invite goes to several recipients at once, only one person receives the full invite details, while others get a blank email or nothing at all. If this matches your situation, try sending invites to recipients individually rather than as a group to confirm whether the issue is specific to multi-recipient sends.
• The event exists in the calendar but the email doesn't arrive. Some users have found the event correctly appears in their own calendar, or the recipient's, even though no notification email was ever received. This points to the notification step specifically failing, rather than the event or invite process itself.
• Responses to an invite not reaching the organiser. Separately from the initial invite, some users have reported that a recipient's Accept or Decline response doesn't make it back to the original sender, which is a distinct issue from the invite itself not arriving.

What to Check First

1. Confirm DKIM is set up and verified for your domain, particularly if the issue only affects external recipients.
2. Ask the recipient to check their spam or junk folder, since a delivered-but-filtered invite looks identical to a failed one from the sender's side.
3. If sending to multiple recipients fails, test sending the same invite to a single recipient to isolate whether it's a multi-recipient-specific issue.
4. If the problem persists after ruling out the above, raise it with Zoho support directly, since some of these patterns have been reported as ongoing platform issues rather than configuration problems on the account side.