Your Reverse DNS Record (PTR) is not a valid host name. According to email sending best practices, a PTR Record should be a valid host name. If the PTR Record is not a valid hostname, there is a likelihood that you will experience email delivery issues with anti-spam services.
However, the IP address of the outgoing IP address was set up back to orcidhub.org.nz:
ping orcidhub.org.nz
PING orcidhub.org.nz (52.65.76.255) 56(84) bytes of data.
(venv) ~/NZ-ORCID-Hub (ORCIDHUB-403)$ host 52.65.76.255
255.76.65.52.in-addr.arpa domain name pointer orcidhub.org.nz.
https://mxtoolbox.com/Pro/domain/orcidhub.org.nz#/ indicates that the reverse DNS is not a valid Hostname.
However, the IP address of the outgoing IP address was set up back to orcidhub.org.nz:
it requires further investigation...
[ORCIDHUB-496] created by rcir178