[SWLUG] Postfix woes: Mail Transport Unavailable

[Huw Lynes]

On Fri, 2010-06-04 at 17:58 +0100, Huw Lynes wrote:
> On Fri, 2010-06-04 at 17:17 +0100, Emyr Derfel wrote:
> > Hi all
> > 
> > This problem concerns the following software, freshly installed on new
> > hardware to replace an unstable WinXP/Vpop3_ISP aliasing solution:
> > Arch Linux, Postfix, Courier-imap, and eventually spamassassin when it
> > works enough to consider poking at again.
> 
> > So far I have 37 messages in the deferred queue, which is only twice
> > the number of angry people I'll have when the boss comes back on
> > Monday.
> 
> Hi Emyr,
> 
> Sorry, I can't help you on the postfix problem since it's been a long
> time since I had to set up mail and it was Exim when I did it. Although
> I will mention that if you are on a consumer internet connection it's
> entirely possible that outbound SMTP is blocked by the ISP. That would
> explain the connection refused message.
> 
Or your own edge router/firewall might be blocking SMTP from everything
except your old mail server.

You can rule this out by telnet'ing to port 25 on an external mail
server to see if you get a connection.

Cheers,
Huw

-- 
Huw Lynes                       | Advanced Research Computing
HEC Sysadmin                    | Cardiff University
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Tel: +44 (0) 29208 70626        | King Edward VII Avenue, CF10 3NB