Use the following steps to disable Sender ID Compliance in Salesforce and remove "noreply@salesforce.com" or "Sent on behalf of" from your outgoing emails.
For more information including required permissions, see the Salesforce help documentation on configuring email deliverability settings. If disabling Sender ID Compliance does not resolve the issue, contact Salesforce Support.
Gmail recipients see 'via (Interchangeable ID).d.bnc.salesforce.com' as the sender
Guidelines for Configuring Deliverability Settings for Emails Sent from Salesforce
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