From: mouss (no email)
Date: Sun Dec 03 2006 - 11:33:03 EST
Stephen Liu wrote:
> Hi mouss,
>
> - snip -
>
>
>>> PING satimis.homelinux.com (58.152.161.53) 56(84) bytes of data.
>>>
>>> --- satimis.homelinux.com ping statistics ---
>>> 3 packets transmitted, 0 received, 100% packet loss, time 2000ms
>>> * end *
>>>
>>>
>>> Ping also failed.
>>>
>>>
>> If you can't ping it, it doesn't exist. blocking ping makes it next
>> to
>> impossible to debug network problems and unless your OS is broken,
>> doesn't bring much security.
>>
>
> I can ping IP address of the server which, a dynamic IP, only updated
> on connection. On browser run IP address of server can browse homepage
> of the server. But with "satimis.homelinux.com" or "58.152.181.13"
> failed.
> ("58.152.181.13" is IP address asigned by dyndns.org/com at
> registration).
>
> Logon dyndns.org/com found server's IP updated, same as indicated on
> "ifconfig". I suspect whether dyndns.org/com has redirected the
> request on "satimis.homelinux.com"/"58.152.181.13" to the server.
>
> Is there anyway to check? TIA.
>
Try connecting from an external IP. you can use dnsstuff site to check
the DNS configuration.
Anyway, using a dynamic IP as an MX is unsafe. a host that uses cached
information will deliver your mail to another server (the one that
ingerits your previous IP) and if the latter accepts this mail, they get
_your_ mail.
Better use an external service and use fetchmail to download your
messages and pass them to your postfix.
>
>>> I'm uncertain whether port 25 is blocked by ISP?
>>>
>>>
>>> However following seems proving the contrary;
>>>
>>> $ sudo telnet mail.netvigator.com 25
>>> Trying 218.102.48.214...
>>> Connected to mail.netvigator.com.
>>> Escape character is '^]'.
>>> 220 wmail02dat.netvigator.com ESMTP server (InterMail vM.6.01.03.02
>>> 201-2131-111 -104-20040324) ready Thu, 30 Nov 2006 17:56:43 +0800
>>> 421 wmail02dat.netvigator.com Lost connection to [219.79.144.238]
>>> Connection closed by foreign host.
>>> * end *
>>>
>>> netvigator.com is ISP. The 220 means connected and they responded
>>>
>> and
>>
>>> are waiting for input?
>>>
>>>
>> broken gateway-ing (218.* has problems talking to 219.*).
>>
>
> What is it. Please explain in more detail. TIA.
>
The server says "220" followed by "421" and closes the session, with no
command sent by you. This is not how SMTP works.
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