Suddenly i faced this issue this morning, SPD workflow can send email to all the domains except my Google App Mail domain.
It can send to gmail, yahoo, hotmail but it doesn't succeed my google app email!
i didn't change anything in google app mail setting or the local SMPT setting.
this is my IIS SMPT configuration
Fully qualified domain name: mail.***
Smart host: smtp.gmail.com
TCP Port: 587
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