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I am not able to forward an email mail that comes from Cox to my cox.net email address.
For example: I received a payment confirmation from Cox (to my cox.net email address). I try to forward this to another cox.net email address or to another email address other than cox.net. It will not send and presents the following message:
"Unable to Send Email
A copy has been placed in your Outbox. Sending the message content to the server failed."
Strangely enough, I can create a new message and send from my cox.net email address and it goes through just fine. Nothing has changed with the settings and this just started today.
This is on iPhone Xs running iOS12.4 with the Apple mail app.