Sender Address Rejected

[DMRDave]

Hi all,

To all the administrators and moderators - thanks for your assistance. You have all been great to work with and gain knowledge from. I have a functional beta server running on SuSE 9, upgraded to version 3.0.1 and have posted here a few times when i've been really stuck.

Today i've gotten the following reponse in attempting to send to an email address.

This is the Postfix program at host dmrmail01.dmrcom.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.


The Postfix program

<randa@mac-companies.com>: host imgate01.cybertime.net[216.117.206.24] said:
554 <dn@poboxdmr.com>: Sender address rejected: RFC1893 ERR 5.7.1 mail
server in RFC 1918 private network (in reply to RCPT TO command)

I'm assuming the reason for this is that i'm being rejected by an anitspam feature that blocks all traffic from an internal 10.10.10.x address. I have my server on an internal LAN for the short term while i test it, and have plans to move it to a public space and public ip soon, which i assume would fix the issue. In the meantime, is there a way to fix this - plus i figure there may be others that have a similar setup and would run across this issue as well? Regards.

[marcmac]

Set a relay host. Or possibly change the public DNS resolution for your mail server, since that's where (I assume) it's getting your IP

[DMRDave]

Thank you. I will try your suggestions and report back asap. Best.

[DMRDave]

I tried both suggestions but the message continued to get rejected to all users of this particular domain. I fixed the problem by giving the mail server a public ip address. After that, my users could send to this particular domain. I attribute it to overzealous spam control by this particular mail server. As for a fix for those users with private ip's, i wish i had a solution for you. Sorry. When i ramp up another test server with a private addess, i'll revisit the issue. Thanks for you assistance.