smtp working from pc but not from mac

I've been using Apple Mail on a Mac (obviously) at work, which is
pretty much a PC-only shop. I've had no problems with this even though
it is not supported. Starting yesterday, however, emails to recepients
outside of the company have been rejected by the company smtp server
with the response "Relaying is prohibited". I can send these emails
fine from outlook on a PC, and I can still send internal company email
fine from the mac.

The smtp setting that I've been using at the mac end is
server=exchange.mycompany.com, port=25, no authentication.

Does anyone have any suggestions on figuring out what's changed so that
I can send email from my mac again? Since this computer is only
grudgingly allowed here, I am hesitant to contact company support about
this issue.

Thanks.

Re: smtp working from pc but not from mac

usenet@smalltime.com wrote:

> I've been using Apple Mail on a Mac (obviously) at work, which is
> pretty much a PC-only shop. I've had no problems with this even though
> it is not supported. Starting yesterday, however, emails to recepients
> outside of the company have been rejected by the company smtp server
> with the response "Relaying is prohibited". I can send these emails
> fine from outlook on a PC, and I can still send internal company email
> fine from the mac.
>
> The smtp setting that I've been using at the mac end is
> server=exchange.mycompany.com, port=25, no authentication.
>
> Does anyone have any suggestions on figuring out what's changed so that
> I can send email from my mac again? Since this computer is only
> grudgingly allowed here, I am hesitant to contact company support about
> this issue.
>
> Thanks.
>

One thing you can try is get the nifty telnet utility.
See what you IP is in relation to your co-workers. Is your IP Static or
is it obtained from a DHCP server?

telnet exchange.mycompany.com 25
helo mycompany.com
mail from:
rcpt to:
See what response you get here.

The likely issue is that the administrators in your company have
reconfigured the relaying options of your excnage such that The IP
address your system is assigned is not permitted to relay through the
server to an external address.

The options available to you are:
1)Change Apple Mail to authenticate, see whether this resolves the matter.
2) Is your Mac configured to login into the domain? I gather the Mac is
your own laptop or you are a graphics designer in an all PC shop.
3) Notify the administrators that you are unable to relay through the
exchange server and provide them with the IP address that your system
has/or is being assigned. They may have altered the AD to assign a
particular IP range to systems that are part of the AD domain, and a
different IP range to non AD systems (which I gather you might fall into)

AK