Received the suspect email hereunder. Took no action
08:10 (2 hours ago)
Hey @dinige , thanks for reaching out to us and bringing this to our attention.
Can you please confirm the sender's full email address?
Just a friendly reminder that any email sent from email@example.com and Optus.com.au is not spam and is safe and secure to open.
A bit suss with the senders email hidden
Even if the sender was "legit", the sender can easily be spoofed (i.e. faked) so you can never rely on that as proof of where it came from.