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