I'm sorry to hear about the issue sending incoming emails for content creation. Could you please try again and let me now if it's still failing?
Nope, still got an error message. It is replicated below:
This is the mail system at host mx1-in2.phx1.jivehosted.com.
I'm sorry to have to inform you that your message could not be delivered to
one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can delete your own
text from the attached returned message.
The mail system
host 10.172.185.96[10.172.185.96] said: 553
address unknown. (in reply to RCPT TO command)
Final-Recipient: rfc822; firstname.lastname@example.org
Remote-MTA: dns; 10.172.185.96
Diagnostic-Code: smtp; 553
Thanks for the confirmation. I've reviewed and see that you're encountering a 553 response, which will require further technical investigation. I would recommend submitting a support case in your private Jive Community customer group and a team member will be happy to assist with the investigation. Please include the full message headers and also the non-deliverable response (such as the one you provided above) for analysis.