[rt-users] RT 4.4 failing to send CC emails

[Luke Hopkins]

I'm running RT 4.4 and for some reason whenever I add a one-time cc to a 
ticket I get the following error appearing on the ticket:
The RT System itself- Sending the previous mail has failed. Please 
contact your admin, they can find more details in the logs.

The logs show:
   [21] [Mon Apr 18 13:33:50 2016] [info]: 
<rt-4.4.0-21-1460986430-505.5793790-6-0@###.####.net> #5793790/36778097 
- Scrip 6 On Correspond Notify Other Recipients 
(/opt/rt4/sbin/../lib/RT/Action/SendEmail.pm:285)
2016-04-18 13:33:50,811 CRIT reaped unknown pid 340)
[21] [Mon Apr 18 13:33:50 2016] [error]: 
<rt-4.4.0-21-1460986430-505.5793790-6-0@###.####.net>: 
`/usr/sbin/sendmail -oi -t -f xx at xxxx.xxx` exited with code 64 
(/opt/rt4/sbin/../lib/RT/Interface/Email.pm:921)
[21] [Mon Apr 18 13:33:50 2016] [critical]: 
<rt-4.4.0-21-1460986430-505.5793790-6-0@###.####.net>: Could not send 
mail with command `/usr/sbin/sendmail -oi -t -f xx at xxxx.xxx`: 
<rt-4.4.0-21-1460986430-505.5793790-6-0@###.####.net>: 
`/usr/sbin/sendmail -oi -t -f xx at xxxx.xxx` exited with code 64 at 
/opt/rt4/sbin/../lib/RT/Interface/Email.pm line 922.

Stack:
   [/opt/rt4/sbin/../lib/RT/Interface/Email.pm:922]
   [/opt/rt4/sbin/../lib/RT/Action/SendEmail.pm:292]
   [/opt/rt4/sbin/../lib/RT/Action/SendEmail.pm:115]
   [/opt/rt4/sbin/../lib/RT/ScripAction.pm:182]
   [/opt/rt4/sbin/../lib/RT/Scrip.pm:664]
   [/opt/rt4/sbin/../lib/RT/Scrips.pm:296]
   [/opt/rt4/sbin/../lib/RT/Transaction.pm:213]
   [/opt/rt4/sbin/../lib/RT/Record.pm:1670]
   [/opt/rt4/sbin/../lib/RT/Ticket.pm:1605]
   [/opt/rt4/sbin/../lib/RT/Ticket.pm:1491]
   [/opt/rt4/sbin/../lib/RT/Interface/Web.pm:2411]
   [/opt/rt4/share/html/Ticket/Display.html:169]
   [/opt/rt4/share/html/Ticket/Update.html:341]
   [/opt/rt4/share/html/Ticket/autohandler:66]
   [/opt/rt4/sbin/../lib/RT/Interface/Web.pm:696]
   [/opt/rt4/sbin/../lib/RT/Interface/Web.pm:375]
   [/opt/rt4/share/html/autohandler:53] 
(/opt/rt4/sbin/../lib/RT/Interface/Email.pm:926)

It is not an issue with the email addresses because it happens to all 
addresses and all the addresses work fine when they are requesters or 
set a CCs but only fail if set as one-time CC.

I've looked at the scripts and they're exactly the same apart from one 
that fails is Notify Other Recipients.

The sendmail exit code also doesn't seem to make any sense.

Has anyone encountered this issue before?
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