How to send meeting-invites?

[alachnit]

Hi,
is there an easy way to send calendar-invitations with an attached invite.ics-file?

This is what I tried:

from icalendar import Calendar, Event as iCalEvent
ical_event = self.createIcalEvent(subject, obj.event) # this method creates the ical

email = EmailSender(
    host=self.instance.settings["mail"]["server"],
    port=self.instance.settings["mail"]["port"],
    cls_smtp=SMTP_SSL,
    use_starttls=False,
    username=self.instance.settings["mail"]["username"],
    password=self.instance.settings["mail"]["password"],
)

email.send(
    subject=subject,
    sender=sender,
    receivers=[recipient],
    text="Please find the calendar invite for our upcoming meeting.",
    attachments={'invite.ics': ical_event},
    headers={
        "Content-Class": "urn:content-classes:calendarmessage",
    },
)

This email gets sent with the invite.ics, but mailclients don't recognize it as an invitation. the invite.ics is simply an attachment.

Thank you in advance
Till