IP Blocker in SBS2003 exchange

Hi,

I have a problem with Outlook Express users sending mail through Exchange
2003 on SBS2003.
Basically, the user can send emails from all places he needs to (ie, home,
office etc) except one. He can receive emails alright, but when he goes to
send it comes up with a cannot find server error.
If I telnet to the server (telnet <FQDN> 110) it works, but if I telnet
<FQDN> 25 it can't find the server. The FQDNs are the same. If I change
the internet connection, it works fine.
I am thinking that the Virtual SMTP server is blocking this one IP address
from sending even though it is setup to connect if authenticated.
Is there an IP Blocker in a standard install of SBS2003?
Or, what else could be causing this?

thanks in advance..
Tony Dawes.


.

Relevant Pages

  • Re: smtp setup from dmz to internal
    ... I can now send emails from the IIS SMTP servers on my DMZ ... How do I setup the FQDN ... server listed in DNS reverse lookups. ...
    (microsoft.public.inetserver.iis.smtp_nntp)
  • Re: Exchange & External DNS
    ... If it's only one server then you don't have to worry about it messing ... Change your fqdn in your smtp vs to the ... The exchange server lives on the internal domain ex.company.int. ... a warning message ans say this could result in emails being rejected. ...
    (microsoft.public.exchange.admin)
  • RE: OMA and Outgoing Spam
    ... Someone hacked a user account and use it to spam emails; ... Your Exchange server is open relaying emails;(You have checked it ... Your server is under RNDR Attack. ... When you enable recipient filtering on the SMTP virtual server, ...
    (microsoft.public.windows.server.sbs)
  • Re: Exchange on SBS 2003 not delivering mail to user
    ... Microsoft CSS Online Newsgroup Support ... How you configured the mail server to send emails? ... on the ISP mail server when using pop3 connector to receive emails. ...
    (microsoft.public.windows.server.sbs)
  • RE: Exchange SMTP Queues full - not receiving external email
    ... I understand that you found many emails were ... attack, Reverse NDR attack or some internal workstations are infected by ... This issue can occur if your exchange server is being used as a relay ... When you enable recipient filtering (if you are using SMTP for incoming ...
    (microsoft.public.windows.server.sbs)
Loading