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date: Sun, 22 Jun 2008 10:02:55 -0400,
group: microsoft.public.inetserver.iis.smtp_nntp
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Re: telnet smtp server
> Hi when I run telnet application 25 in doc, noting happened. is it the
> port 25 being blocked?
It's either the port being blocked at some point between you and the SMTP
service, or the SMTP service is not running on port 25.
> How to check it?
A comprehensive guide is impossible here. Use netstat -ano to find out if
the service is bound to port 25. If so, connect to 127.0.0.1 on port 25
(from the mailserver itself, of course): only in extremely rare
circumstances would that loopback connection be blocked. If that works,
but connections from remote machines do not, check the config of Windows'
built-in firewall, followed by any 3rd-party endpoint security on the box,
followed then by routers + firewalls between the hosts....
--Sandy
------------------------------------
Sanford Whiteman, Chief Technologist
Broadleaf Systems, a division of
Cypress Integrated Systems, Inc.
------------------------------------
date: Sun, 22 Jun 2008 21:22:39 -0400
author: Sanford Whiteman
Re: telnet smtp server
Thanks Sandy. You're so good :)
I try on mailserver itself: telnet 127.0.0.1 25(also local
IP:192.168.0.100), didn't work, return to dos prompt right the way.
But work when I use public IP. I have two network cards on that server and
one is connect to Internet, the other one is connected to local hub.
Still couldn't find out why.
Since the public IP works, so I use public IP to specify relay and as smart
host and the emails go to smark host and then go to Internet, I can see that
in the Queue folder.
Now bring three questions:
1. Use public IP do the relay is slow than use local IP, is it all the
emails need to route to internet?
2. The email service server have A record, and seems all the email go
through it will be delivered to the mail box without any problms, if I
select "try deliver directly then smart host" option in another server, the
result is
the emails will be delivered to google, not hotmail and yahoo. I also found
in event log, somthing said, the connection is rejected or dropped.
3. why telent 127.0.0.1 telent failed.
Please help.
"Sanford Whiteman" wrote
in message news:op.uc6gr1ir6c17zw@gw02.broadleaf.local...
> > Hi when I run telnet application 25 in doc, noting happened. is it the
> > port 25 being blocked?
>
> It's either the port being blocked at some point between you and the SMTP
> service, or the SMTP service is not running on port 25.
>
> > How to check it?
>
> A comprehensive guide is impossible here. Use netstat -ano to find out if
> the service is bound to port 25. If so, connect to 127.0.0.1 on port 25
> (from the mailserver itself, of course): only in extremely rare
> circumstances would that loopback connection be blocked. If that works,
> but connections from remote machines do not, check the config of Windows'
> built-in firewall, followed by any 3rd-party endpoint security on the box,
> followed then by routers + firewalls between the hosts....
>
> --Sandy
>
>
> ------------------------------------
> Sanford Whiteman, Chief Technologist
> Broadleaf Systems, a division of
> Cypress Integrated Systems, Inc.
> ------------------------------------
date: Sun, 22 Jun 2008 22:32:14 -0400
author: unknown
Re: telnet smtp server
> I try on mailserver itself: telnet 127.0.0.1 25(also local
> IP:192.168.0.100), didn't work, return to dos prompt right the way.
> But work when I use public IP. I have two network cards on that
> server and one is connect to Internet, the other one is connected to
> local hub. Still couldn't find out why.
Did you run a netstat to check the binding? It sounds like you are
simply not bound to 127.0.0.1:25 in the IIS config.
> Now bring three questions:
> 1. Use public IP do the relay is slow than use local IP, is it all the
> emails need to route to internet?
I prefer to use loopback because it is more portable. But the stack is
smart enough to know that primary/secondary IPs bound to local NICs
are also loopback addresses, so you will not have a performance issue.
And there is no diff between a private-only (RFC 1918) and publicly
valid IP as far as the local box is concerned.
> 2. The email service server have A record, and seems all the email go
> through it will be delivered to the mail box without any problms, if I
> select "try deliver directly then smart host" option in another server,
> the
> result is
> the emails will be delivered to google, not hotmail and yahoo. I also
> found
> in event log, somthing said, the connection is rejected or dropped.
Make sure any mailserver passes the PTR-EHLO-A roundtrip test...
> 3. why telent 127.0.0.1 telent failed.
See above.
--Sandy
------------------------------------
Sanford Whiteman, Chief Technologist
Broadleaf Systems, a division of
Cypress Integrated Systems, Inc.
------------------------------------
date: Sun, 22 Jun 2008 23:52:21 -0400
author: Sanford Whiteman
Re: telnet smtp server
Thanks Sanford,
>>> I prefer to use loopback because it is more portable.
How to use loopback?
>>Make sure any mailserver passes the PTR-EHLO-A roundtrip test
I run teh smtpdiag and all ok, but If I get rif of relay and send email out
directly, sooner, my server will be listed as spam list. How to avoid that?
"Sanford Whiteman" wrote
in message news:op.uc6npjty6c17zw@gw02.broadleaf.local...
> > I try on mailserver itself: telnet 127.0.0.1 25(also local
> > IP:192.168.0.100), didn't work, return to dos prompt right the way.
> > But work when I use public IP. I have two network cards on that
> > server and one is connect to Internet, the other one is connected to
> > local hub. Still couldn't find out why.
>
> Did you run a netstat to check the binding? It sounds like you are
> simply not bound to 127.0.0.1:25 in the IIS config.
>
> > Now bring three questions:
> > 1. Use public IP do the relay is slow than use local IP, is it all the
> > emails need to route to internet?
>
> I prefer to use loopback because it is more portable. But the stack is
> smart enough to know that primary/secondary IPs bound to local NICs
> are also loopback addresses, so you will not have a performance issue.
> And there is no diff between a private-only (RFC 1918) and publicly
> valid IP as far as the local box is concerned.
>
> > 2. The email service server have A record, and seems all the email go
> > through it will be delivered to the mail box without any problms, if I
> > select "try deliver directly then smart host" option in another server,
> > the
> > result is
> > the emails will be delivered to google, not hotmail and yahoo. I also
> > found
> > in event log, somthing said, the connection is rejected or dropped.
>
> Make sure any mailserver passes the PTR-EHLO-A roundtrip test...
>
> > 3. why telent 127.0.0.1 telent failed.
>
> See above.
>
> --Sandy
>
>
>
> ------------------------------------
> Sanford Whiteman, Chief Technologist
> Broadleaf Systems, a division of
> Cypress Integrated Systems, Inc.
> ------------------------------------
date: Thu, 12 Jun 2008 12:38:20 -0400
author: unknown
Re: telnet smtp server
>>>> I prefer to use loopback because it is more portable.
> How to use loopback?
Loopback = 127.0.0.1. Portable because it exists on every host,
instead of having to know a bound IP address assigned to a particular
host.
>>> Make sure any mailserver passes the PTR-EHLO-A roundtrip test
> I run teh smtpdiag and all ok, but If I get rif of relay and send email
> out
> directly, sooner, my server will be listed as spam list. How to avoid
> that?
SMTPDIAG is not the roundtrip test. Search the ng archives for my post
on the roundtrip. It involves a fluency with, and control over,
forward and reverse DNS. If you don't pass the roundtrip, your
delivery will be unreliable. (Note that failing the roundtrip will
*not* get you *blacklisted* -- that is, you will not be entered into a
database that would persist even after you have fixed your config. As
soon as you clear up your config, your mail will be accepted by those
servers that enforce the roundtrip.)
--Sandy
------------------------------------
Sanford Whiteman, Chief Technologist
Broadleaf Systems, a division of
Cypress Integrated Systems, Inc.
------------------------------------
date: Mon, 23 Jun 2008 15:23:11 -0400
author: Sanford Whiteman
Re: telnet smtp server
Thanks Sanford,
I will try roundtrip test first.
"Sanford Whiteman" wrote
in message news:op.uc7usxer6c17zw@gw02.broadleaf.local...
> >>>> I prefer to use loopback because it is more portable.
> > How to use loopback?
>
> Loopback = 127.0.0.1. Portable because it exists on every host,
> instead of having to know a bound IP address assigned to a particular
> host.
>
> >>> Make sure any mailserver passes the PTR-EHLO-A roundtrip test
> > I run teh smtpdiag and all ok, but If I get rif of relay and send email
> > out
> > directly, sooner, my server will be listed as spam list. How to avoid
> > that?
>
> SMTPDIAG is not the roundtrip test. Search the ng archives for my post
> on the roundtrip. It involves a fluency with, and control over,
> forward and reverse DNS. If you don't pass the roundtrip, your
> delivery will be unreliable. (Note that failing the roundtrip will
> *not* get you *blacklisted* -- that is, you will not be entered into a
> database that would persist even after you have fixed your config. As
> soon as you clear up your config, your mail will be accepted by those
> servers that enforce the roundtrip.)
>
> --Sandy
>
>
> ------------------------------------
> Sanford Whiteman, Chief Technologist
> Broadleaf Systems, a division of
> Cypress Integrated Systems, Inc.
> ------------------------------------
date: Thu, 12 Jun 2008 15:54:02 -0400
author: unknown
Re: telnet smtp server
Hi Sandy,
I run nslookup as below, can you please tell me what is my PTR? If I didn't
pass roundtrip test, where the emails go? Please advice.
E:\Tools\SmtpDiag\SmtpDiag>nslookup -q=ptr 204.10.241.84
*** Can't find server name for address 192.168.0.106: Non-existent domain
*** Can't find server name for address 204.10.240.130: No response from
server
*** Can't find server name for address 204.10.240.131: No response from
server
*** Default servers are not available
Server: UnKnown
Address: 192.168.0.106
DNS request timed out.
timeout was 2 seconds.
*** Request to UnKnown timed-out
E:\Tools\SmtpDiag\SmtpDiag>nslookup -q=ptr cashx.ca
*** Can't find server name for address 192.168.0.106: Non-existent domain
*** Can't find server name for address 204.10.240.130: No response from
server
*** Can't find server name for address 204.10.240.131: No response from
server
*** Default servers are not available
Server: UnKnown
Address: 192.168.0.106
cashx.ca
primary name server = ns1.actionhosting.ca
responsible mail addr = support.actionhosting.biz
serial = 2007091224
refresh = 3600 (1 hour)
retry = 900 (15 mins)
expire = 604800 (7 days)
default TTL = 14400 (4 hours)
Can
"Sanford Whiteman" wrote
in message news:op.uc7usxer6c17zw@gw02.broadleaf.local...
> >>>> I prefer to use loopback because it is more portable.
> > How to use loopback?
>
> Loopback = 127.0.0.1. Portable because it exists on every host,
> instead of having to know a bound IP address assigned to a particular
> host.
>
> >>> Make sure any mailserver passes the PTR-EHLO-A roundtrip test
> > I run teh smtpdiag and all ok, but If I get rif of relay and send email
> > out
> > directly, sooner, my server will be listed as spam list. How to avoid
> > that?
>
> SMTPDIAG is not the roundtrip test. Search the ng archives for my post
> on the roundtrip. It involves a fluency with, and control over,
> forward and reverse DNS. If you don't pass the roundtrip, your
> delivery will be unreliable. (Note that failing the roundtrip will
> *not* get you *blacklisted* -- that is, you will not be entered into a
> database that would persist even after you have fixed your config. As
> soon as you clear up your config, your mail will be accepted by those
> servers that enforce the roundtrip.)
>
> --Sandy
>
>
> ------------------------------------
> Sanford Whiteman, Chief Technologist
> Broadleaf Systems, a division of
> Cypress Integrated Systems, Inc.
> ------------------------------------
date: Mon, 23 Jun 2008 22:25:12 -0400
author: unknown
Re: telnet smtp server
> I run nslookup as below, can you please tell me what is my PTR?
You don't have a working DNS server that can resolve your server's PTR
from inside -- that's bad and shows that something in your internal
architecture is improper.
From outside, 204.10.241.84 has PTR smtp.cashx.ca; smtp.cashx.ca has
an A record resolving to 204.10.241.84. That's good. But is
smtp.cashx.ca the EHLO (fully-qualified domain name) of your
mailserver? If not, you will not pass the roundtrip.
> If I didn't pass roundtrip test, where the emails go? Please advice.
I think this should be pretty clear from my posts in the ng archives.
The roundtrip test is a way of approximating whether e-mails came from
a properly managed mailserver. If a remote server enforces the
roundtrip fully, it will not accept your mail. In other cases, it will
"weight" your mail negatively, so it is more likely to be seen as
junk.
--Sandy
------------------------------------
Sanford Whiteman, Chief Technologist
Broadleaf Systems, a division of
Cypress Integrated Systems, Inc.
------------------------------------
date: Tue, 24 Jun 2008 16:34:54 -0400
author: Sanford Whiteman
Re: telnet smtp server
Thanks Sandy,
> You don't have a working DNS server that can resolve your server's PTR
> from inside -- that's bad and shows that something in your internal
> architecture is improper.
I will check this later.
> From outside, 204.10.241.84 has PTR smtp.cashx.ca; smtp.cashx.ca has
> an A record resolving to 204.10.241.84. That's good. But is
> smtp.cashx.ca the EHLO (fully-qualified domain name) of your
> mailserver? If not, you will not pass the roundtrip.
I'm use workgroup. Now I'm putting "cashx.ca" in the SMTP domain name, is
it this EHLO? I can change to smtp.cashx.ca. How to verify that?
> > If I didn't pass roundtrip test, where the emails go? Please advice.
>
> I think this should be pretty clear from my posts in the ng archives.
> The roundtrip test is a way of approximating whether e-mails came from
> a properly managed mailserver. If a remote server enforces the
> roundtrip fully, it will not accept your mail. In other cases, it will
> "weight" your mail negatively, so it is more likely to be seen as
> junk.
>
> --Sandy
>
>
>
> ------------------------------------
> Sanford Whiteman, Chief Technologist
> Broadleaf Systems, a division of
> Cypress Integrated Systems, Inc.
> ------------------------------------
date: Tue, 24 Jun 2008 17:02:45 -0400
author: unknown
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