Less of your spam thanks wrote:

> If anyone can help with this I'd appreciate it. I'm trying to set up a
> small intranet server, and want to send email out via PHP's mail command
> and sendmail.
>
> Now, in PINE and PHP, the system has set my sender email address to
> "linuxuser@webserver.ourcompany.com". This results in some mailservers
> dropping mail from our machine as "webserver.ourcompany.com" doesn't
> resolve. The exact error message is "(reason: 550
> <linuxuser@webserver.ourcompany.com>: Sender address rejected: Domain
> not found)"
>
> I guess I've made a configuration boo-boo when I set the box up, here's
> what I have:
>
> hostname = webserver
> domainname = ourcompany.com
> dnsdomainname = ourcompany.com
>
> How do I configure my system so that the sender address is
> "linuxuser@ourcompany.com" rather than it inserting the hostname in the
> Sender: part? I'd prefer to do this at the system level rather than
> modifying the Sender: address in each and every application I use. (I've
> no idea if the error I'm making is a Slackware one, or a Sendmail one).
>
> Just a note: The intranet server is behind a firewall, our domain
> 'ourcompany.com' is valid, but the subdomain 'webserver.ourcompany.com'
> is not. That's simply what we've called the system on our internal
> network. Is it at this point I'm going wrong, and should I call it
> something else internally?
>
> Thanks in advance

Hello,

I think the Return-Path of your e-mail is set to
something@webserver.ourcompany.com. There are 2 ways to get rid of this
problem:

- Workaround: change your Return-Path of the e-mail you send.
- Fix: configure sendmail to masquerade as ourcompany.com instead of
webserver.ourcompany.com, especially if you are sending e-mail to the
Internet.

Regards,

Tristan