On Jun 11, 2007, at 10:16 AM, Graham Brown ((CompSYS)) wrote:
> Totally OT I know and probably a bit of a swear word on this forum!!
Actually, should be [NF], since this is tech-related.
> I've just inherited an ASP.NET (c#) app. The customer has just
> moved the
> hosting and now it won't send emails. There are no obvious error
> messages,
> it seems to go through but the emails never arrive. The code hasn't
> changed
> and I can't see anywhere the application is sending any sort of
> authentication. It just uses the standard built in SMTMail object.
>
> My guess is that the new hosts have their mailserver locked down to
> prevent
> spam but I don't know, and of course the new webhosts have washed
> their
> hands of it!!
>
> Could anyone point me in the general direction of any
> troubleshooting guides
> or give me any sort of pointers?
Sounds like port 25 is blocked by the firewall, or the host
specified for the SMTP object is not the right one anymore. Example:
a lot of my Python scripts send email notices, but they are all set
to use leafe.com as the SMTP server. If I copied them to another
location outside of my network, they wouldn't work, since my server
would refuse to relay mail from outside of the LAN.
For the port blocking, open a DOS prompt, and type 'telnet <host>
25', where <host> is the name/addr of your SMTP host. If you don't
get a normal SMTP prompt, then you aren't reaching the host, and the
port is most likely blocked. A message like:
Connecting To <host>...Could not open connection to the host, on port
25: Connect failed
...is a pretty good sign that the port is blocked.
-- Ed Leafe
-- http://leafe.com
-- http://dabodev.com
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