I am currently testing a new RT installation. Currently I am able to send,
via telnet, email from the RT address r...@host.example.com to an internal
address (u...@example.com).

# telnet host.example.com 25
Trying 192.168.231.42...
Connected to host.example.com.
Escape character is '^]'.
220 host.example.com ESMTP Postfix
EHLO host.example.com
250-host.example.com
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
MAIL FROM: r...@host.example.com
250 2.1.0 Ok
RCPT TO: u...@example.com
250 2.1.5 Ok
DATA
354 End data with <CR><LF>.<CR><LF>
SUBJECT: Testing from r...@zen-rt.zeiders.com to pwi...@zeiders.com
Telnet session
.
250 2.0.0 Ok: queued as 95E3F80900
quit
221 2.0.0 Bye

Mail log generated:
Jan 15 17:06:26 zen-rt postfix/qmgr[6294]: 95E3F80900: from=<
r...@host.example.com>, size=449, nrcpt=1 (queue active)
Jan 15 17:06:26 zen-rt postfix/smtp[6388]: 95E3F80900: to=<
pwi...@example.com>, relay=mail1.example.com[192.168.231.10]:25, delay=44,
delays=44/0/0.01/0.26, dsn=2.6.0, status=sent (250 2.6.0 <
20140115220553.95e3f80...@host.example.com> Queued mail for delivery)
Jan 15 17:06:26 zen-rt postfix/qmgr[6294]: 95E3F80900: removed


Sending from u...@example.com into the RT server, though results in the
following:

# telnet host.example.com 25
Trying 192.168.231.42...
Connected to host.example.com.
Escape character is '^]'.
220 host.example.com ESMTP Postfix
EHLO host.example.com
250-host.example.com
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
MAIL FROM: u...@example.com
250 2.1.0 Ok
RCPT TO: r...@host.example.com
250 2.1.5 Ok
DATA
354 End data with <CR><LF>.<CR><LF>
SUBJECT: Testing from u...@example.com to r...@host.example.com
Telnet session
.
250 2.0.0 Ok: queued as 314F2808AD
quit
221 2.0.0 Bye

Mail log generated:
Jan 15 17:09:14 zen-rt postfix/qmgr[6294]: 314F2808AD: from=<
u...@example.com>, size=447, nrcpt=1 (queue active)
Jan 15 17:09:15 zen-rt postfix/local[6409]: 314F2808AD: to=<
r...@host.example.com>, relay=local, delay=54, delays=53/0.01/0/0.11,
dsn=4.3.0, status=deferred (temporary failure. Command output: HTTP request
failed: 500 No Host option provided. Your webserver logs may have more
information or there may be a network problem. )
Jan 15 17:09:16 zen-rt postfix/smtpd[6375]: disconnect from host.example.com
[192.168.231.42]

I have searched around online and have not seen anything that even
references this problem. If anyone can provide any insight I will be very
appreciative.

-Mathew

"When you do things right, people won't be sure you've done anything at
all." - God; Futurama

"We'll get along much better once you accept that you're wrong and neither
am I." - Me

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