Running Exchange 2003 on Windows 2003; single instance of Exchange (does OWA, mailboxes, ActiveSync, etc).
When sending emails, we are getting
"smtp;553 5.3.0: relaying is NOT allowed here"
"#5.5.0 smtp;550 Invalid address"
"#5.5.0 smtp;550 #5.1.0 Address rejected"
from known good email addresses.
I saw a post to turn OFF anonymous access to SMTP, but then we won't recieve email. We have 1 SMTP Virtual Server with a name of our FQDN of the mail server.
Under Authentication on the SMTP Virtual Server I have enabled "Anonymous Access" and "Integrated Windows Authentication". Under Relay "Only the list below" which is empty , UNCHECKED is "Allow all computers which successfully authenticate to relay...." and under Users is empty.
In front of my Exchange server I have a firewall and a Trend Micro IGSA filtering SPAM and scanning for Viruses. I'm not an Exchange expert, looking for a way to get us able to send email again.
I ran a rest at www.test-smtp.com
against my mail server at got this:
<<< 250 2.0.0 OK
>>> MAIL FROM: <firstname.lastname@example.org>
<<< 250 2.0.0 Resetting
>>> RCPT TO: <email@example.com>
<<< 250 2.1.0 firstname.lastname@example.org....Sender OK