If you took a looked into Salesforce-Outbound-Emails-Impacted-by-Google-DMARC-Policy
I understood we can't use other gmail address to send email from salesforce instance.
So as per my understanding if we just set the from address in single email message then this Google DMARC-Policy security will not effect.
So basically we need to use organisation wide address to set the from address in single email message. This way we can solve this issue.
My idea is using organisation wide address because this security will effect only those email which are generated from @gmail.com domain.
If we use @ourcompanyAddress.com then issue may resolved.
Can anyone confirm if my understanding is correct or any other steps that we need to follow for Google DMARC-Policy security?