Invitations i send to my clients from Zoho calendar always end up in their spam folder

Invitations i send to my clients from Zoho calendar always end up in their spam folder

When i send an invitation to a client of mine (not to all clients but some of them) the invitations go into their spam or junk folder. I had this issue twice until now, with the client missing the meetings that i thought they were aware.

Thank you
Constantinos


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