Definition
An ICS calendar invite is an email containing a calendar file (usually .ics) that lets recipients add an event to their calendar with one click. It is commonly used for meetings, webinars, bookings and events.
Because calendar invites look unusual, they need clear context: a clear subject, a visible event summary in the body, and instructions. Recipients must also be expecting it, since unsolicited calendar invitations are a spam and phishing vector.
Correct usage matters for deliverability and trust. Send invites from your authenticated domain, confirm consent where appropriate, and include clear event details so the invite is obviously legitimate and useful.
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Frequently Asked Questions
It is an email with a calendar file (.ics) that lets recipients add an event to their calendar, commonly used for meetings, webinars and bookings.
Yes, if unsolicited or unclear, they can look like spam or phishing. Send them from your authenticated domain and only to people expecting them.
Use your authenticated domain, set a clear subject and event summary, add plain-text context, and only send to recipients who expect the invitation.