I send the support bundle by email to email@example.com.
The transmission failed with the following error message.
NOTICE: Delivery Failure.
This Delivery Status Notification is sent from MTA...
Your delivery to the following address has been failed.
Please refer to the below for details.
Delivery failed: firstname.lastname@example.org.
188.8.131.52 does not like recipient.
Remote host said[Response Message]: 553-5.1.2 The recipient address is not a valid RFC-5321
553 5.1.2 address. b19-v6si940135pfm.5 - gsmtp
Giving up on 184.108.40.206.
STEP: RCPT TO
later call it a day, I will try to send mail again at home.