FROM Headers in Email Can Be Rewritten
If you don't complete the Procedures to Set Up DKIM in Your Production Account, the FROM header on emails sent from NetSuite will be rewritten by default.
When the FROM header is rewritten, the original email address is moved to the display string, and the email address related to SMTP refers to netsuite.com. For example, an email from jsmith@example.com would be rewritten to jsmith@example.com <system@sent-via.netsuite.com>.
What your recipients see as the sender depends on the email client in use at the recipient’s site.
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Some recipients will see the original email address with the modified <system@sent-via.netsuite.com> FROM header.
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Some recipients might not see the original email address, only the display string.
You may be concerned about the branding of your email messages. That is, you want only your domain name displayed in the FROM header of your email messages. If so, follow the Procedures to Set Up DKIM in Your Production Account.
Note that sent-via.netsuite.com is a shared email domain.