Hah! Is it some simple typo?
You said
> Uber users can initiate support tickets by replying to certain
emails; the
> replies go to [email protected].
But then
> Result: 25: SMTP error from remote mail server after RCPT TO:<
> [email protected]>: 454 4.7.1 <[email protected]>:
Relay
> access denied
I would rather think, the sender made a simple mistake.
frontends.uber.com is not help.uber.com
Does [email protected] exist at all? You said they need to use
"[email protected]"
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