If there's a mail admin from canterbury.ac.nz on list, could you have a
quick look at your server?
We're not seeing mail coming from you because your server doesn't come
back to have another go.
We run a 10 minute greylist timer but you don't seem to come back for
another go.
# grep canterbury.ac.nz mail.log
May 24 21:46:04 mx postfix/smtpd[22652]: connect from
cantva.canterbury.ac.nz[132.181.2.27]
May 24 21:46:05 mx tumgreyspf[22740]: Initial greylisting:
REMOTEIP="132.181.2.27" HELO="cantva.canterbury.ac.nz"
SENDER="stephen.hickson(a)canterbury.ac.nz"
RECIPIENT="don(a)bowenvale.co.nz" QUEUEID=""
May 24 21:46:05 mx postfix/smtpd[22652]: NOQUEUE: reject: RCPT from
cantva.canterbury.ac.nz[132.181.2.27]: 450 4.7.1