Hello @SOAR365 ,
When an email is forwarded, the email client (Gmail, Yahoo, Outlook, etc.) will reinterpret the code and essentially rebuild it for forwarding from their end. What this means is that we don't have control over how the email client chooses to forward the email.
There really isn't a fix for this, since this is 100% on the end of the forwarding email system. If you regularly have your emails forwarded, it will probably be to your benefit to have those forwardees added as contacts so you can send the unadulterated emails directly to them.
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