Message blocked Your message to 111.111@gmail.com has been blocked. See technical details below for more information.

[mird...@gmail.com]

To whom it may concern,

Recently, I have created a google form to make some registration for my conference. And also, I used an ADD-On to make confirmation mail to respondent.
Anyways, when I run a test for this confirmation mail, This mail sent to me like this "Message blocked
Your message to 111...@gmail.com has been blocked. See technical details below for more information."
I have tried to solve this problem, but it couldn't work. I need your suggestion and helping to solve this problem urgentyly

I'm looking forward to your reply soon.

Thank you so much
Suppason Thitthaweerat

[collectiond...@gmail.com]

message blocked

[dokie...@gmail.com]

https://www.digitbin.com/message-blocked-gmail-rejected/