Hello everyone, I have observed an interesting case where calendar invites send by google to another third-party email service are being rejected on the way back (ie. when accepted) if the receiver of the invites is in DMARC reject.
I have also observed that in some cases there are two sets of response buttons present in the calendar invitation email. One set is the usual google response buttons found towards the bottom of the email, and the other set is out-of-band response buttons found towards the top of the email. I have shown some examples below. Google buttons: Out-of-band buttons: When accepting the invitation using the google response buttons, the email is rejected and the responder receives a 5.7.1 DSN back due to the responder's domain having a DMARC reject policy. However, when accepting the invitation using the out-of-band buttons the email is sent through the correct servers, DMARC passes and the response is received successfully by Google. Those out-of-band buttons do not always exist. Some mail clients display them and some do not. Also, it depends if a desktop mail client is used or webmail. During my testing I found the following: Google --> Office 365 domain that is in DMARC reject - working but office 365 domain needs to reply using the out-of-band buttons Google --> AOL - not working as AOL does not display out-of-band buttons Google --> Yahoo - working but Yahoo needs to reply using the out-of-band buttons My question 1: is using the out-of-band buttons the only workaround for the moment and if it is, what happens when those buttons are not available? My question 2: is there any work done by google to resolve this? Hey Brandon, can you give some insight on the above issue? Regards, Ivan Kovachev
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