php mail uses wrong From: hostname

pjeffe

I'm using php mail on an EC2-hosted server, and am getting mail rejected from some recipients because the From: hostname used in the MAIL command is the internal EC2 name and not the public one:

>>> MAIL From: SIZE=1164

... Domain of sender address root@ip-10-203-20-30.ec2.internal does not exist

501 5.6.0 Data format error

I don't want to change the system's hostname since I'm not sure what else that might effect, so I'd rather have a fix that's local to osTicket.

I've looked around quite a bit but can't figure out where this is set, can someone point me to how I can change it?

Also, is there a way I can get verbose debug output from the SMTP exchange so I can see the effect of changes, similar to running sendmail with the -v flag?

Thanks for any help!

pjeffe

OK, just after I posted this I realized that it's really a sendmail issue, since sendmail is ultimately the one sending the mail and it controls the envelope data. So I edited /etc/mail/sendmail.mc and added:

define(`confDOMAIN_NAME', `real.domain.name')dnl

and ran make in /etc/mail (had to do "yum install sendmail-cf" first) and that did the job (it generates the Dj line in sendmail.cf that determines the envelope From: domain name).