I managed to make the change manually and it has had an effect but I think I'm still missing something.
I'll post what comes up on the STMP log but before I do - FYI I am sending an invite to a user in profile manager, named 'srvadmin'. I've set his email address as 'hxsapple@holycross.kingston.sch.uk'. We're using a relay and I think it is because of the 'noreply' email address that we're getting bounced.
Dec 11 10:28:01 xnet-macsrv01.school postfix/master[4390]: daemon started -- version 2.11.0, configuration /Library/Server/Mail/Config/postfix
Dec 11 10:28:20 xnet-macsrv01.school postfix/pickup[4400]: DCA28559DD1: uid=220 from=<noreply@xnet-macsrv01.school>
Dec 11 10:28:20 xnet-macsrv01.school postfix/cleanup[4475]: DCA28559DD1: message-id=<566aa544d3131_11763ff0190280d41089a@xnet-macsrv01.school.mail>
Dec 11 10:28:20 xnet-macsrv01.school postfix/qmgr[4401]: DCA28559DD1: from=<noreply@xnet-macsrv01.school>, size=38600, nrcpt=1 (queue active)
Dec 11 10:28:21 xnet-macsrv01.school postfix/smtpd[4482]: connect from localhost[127.0.0.1]
Dec 11 10:28:21 xnet-macsrv01.school postfix/smtpd[4482]: 566F5559DF8: client=localhost[127.0.0.1]
Dec 11 10:28:21 xnet-macsrv01.school postfix/cleanup[4475]: 566F5559DF8: message-id=<566aa544d3131_11763ff0190280d41089a@xnet-macsrv01.school.mail>
Dec 11 10:28:21 xnet-macsrv01.school postfix/qmgr[4401]: 566F5559DF8: from=<noreply@xnet-macsrv01.school>, size=39086, nrcpt=1 (queue active)
Dec 11 10:28:21 xnet-macsrv01.school postfix/smtp[4477]: DCA28559DD1: to=<hxsapple@holycross.kingston.sch.uk>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.48, delays=0.02/0.06/0.01/0.38, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 566F5559DF8)
Dec 11 10:28:21 xnet-macsrv01.school postfix/qmgr[4401]: DCA28559DD1: removed
Dec 11 10:28:21 xnet-macsrv01.school postfix/smtp[4484]: Untrusted TLS connection established to mailrelay.lgfl.org.uk[172.30.178.12]:25: TLSv1 with cipher ADH-AES256-SHA (256/256 bits)
Dec 11 10:28:21 xnet-macsrv01.school postfix/smtp[4484]: 566F5559DF8: to=<hxsapple@holycross.kingston.sch.uk>, relay=mailrelay.lgfl.org.uk[172.30.178.12]:25, delay=0.14, delays=0/0.03/0.07/0.04, dsn=5.7.1, status=bounced (host mailrelay.lgfl.org.uk[172.30.178.12] said: 554 5.7.1 <hxsapple@holycross.kingston.sch.uk>: Recipient address rejected: Blocked by policy (in reply to RCPT TO command))
Dec 11 10:28:21 xnet-macsrv01.school postfix/cleanup[4475]: 7B5F1559DFC: message-id=<20151211102821.7B5F1559DFC@xnet-macsrv01.school>
Dec 11 10:28:21 xnet-macsrv01.school postfix/bounce[4487]: 566F5559DF8: sender non-delivery notification: 7B5F1559DFC
Dec 11 10:28:21 xnet-macsrv01.school postfix/qmgr[4401]: 7B5F1559DFC: from=<>, size=41319, nrcpt=1 (queue active)
Dec 11 10:28:21 xnet-macsrv01.school postfix/qmgr[4401]: 566F5559DF8: removed
Dec 11 10:28:21 xnet-macsrv01.school postfix/local[4488]: error: od[getpwnam_ext]: no record for user noreply
Dec 11 10:28:21 xnet-macsrv01.school postfix/pipe[4489]: 7B5F1559DFC: to=<noreply@xnet-macsrv01.school>, relay=dovecot, delay=0.08, delays=0/0.01/0/0.07, dsn=5.1.1, status=bounced (user unknown)
Dec 11 10:28:21 xnet-macsrv01.school postfix/qmgr[4401]: 7B5F1559DFC: removed​
What do you think? I've been struggling to find where I can set the domain for the 'noreply' email!
Thanks - Rory.