Hey there...

Hope someone out there might have a bit more knowledge in this area than I do.

I have the following setup:

I am running sendmail on a red hat 9 server. The server is one of three boxes on a private LAN. I have a fully qualified domain (devbox.us) which is managed via DynDns (as a custom DNS); my router keeps this IP up-to-date. I have also added an appropiate MX record to my server in my DynDns account.

I am able to receive mail from anyone, and I am able to send mail to most. Unfortunatley, any ISP on the SPAM-wagon rejects mail sent from my host because the headers report the mail as being sent from localhost.localdomain instead of from devbox.us

I have been reading post after post and two different books, the verdict seems to be that sendmail determines the host for itself and there is no way to tell it what the hostname is?? is this true or am I missing something?

I have set the masquerading features in sendmail, and have added the appropriate entry in the local-host-names file (as well as the access.db, obviously since I can relay).

Under the above configuration, is there anyway to tell sendmail to use my legitimate domain?

Thanks in advance for any help

Dave

Did you set the masquerade option? In sendmail.cf, you would do this:
DMdevbox.us

Of course, you should try to keep your sendmail.mc authoritative, and generate sendmail.cf from it:
MASQUERADE_AS(`devbox.us')dnl
FEATURE(`masquerade_envelope')dnl

You generate sendmail.cf from sendmail.mc thusly:
m4 sendmail.mc > sendmail.cf

Of course, after those changes you need to restart sendmail, e.g.:
/etc/init.d/sendmail restart

Hey there...

I have previously done all that you have suggested; this is what I meant by "masquerade options", apologies for the confusion.

however, I DO create the cf a bit differently: build -C /etc/mail sendmail.cf
This builds the cf out of the mc, is this different than the m4 command that you have outlined?

I think that my issue has something to do with the fact that my server has a private space class-c IP. This works well enough taking in traffic because the box serves as the DMZ for the LAN, but I think this is messing with sendmail... I suspect that if I had a static IP rather than going through this game with the dynamic one that this wouldn't be an issue.

thanks for your time

Dave

I had this problem until I decided to relay through my ISP. I added:
define(`SMART_HOST',`isp.mail.host')dnl

Hi...

Thanks for the input!


unfortunately, this doesn't seem to make any difference at all...should I be disabling some setting when I enable SMART_HOST?

Thanks

Dave