cannot connect to any mailbox using telnet...

February 18, 2011 at 05:21:18
Specs: Linux x86_64
i am using open suse 11.3 as OS.. when i try to connect to any mail server over smtp using telnet, their is either a connection time out or server not found error msg....
pls help

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#1
February 18, 2011 at 06:15:26
Have you checked, whether you can reach the mail server with nmap?
nmap -v -P0 -p 25 mailserver.com

where mailserver.com must be exchanged with the name of the mailserver, you'd like to contact and check port 25.

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#2
February 18, 2011 at 06:44:17
here's the result for nmap...
tried gmail over 25 using telnet....no response

Starting Nmap 5.00 ( http://nmap.org ) at 2011-02-18 20:12 IST
NSE: Loaded 0 scripts for scanning.
Initiating Parallel DNS resolution of 1 host. at 20:12
Completed Parallel DNS resolution of 1 host. at 20:12, 0.02s elapsed
Initiating SYN Stealth Scan at 20:12
Scanning bom01s01-in-f83.1e100.net (209.85.153.83) [1 port]
Completed SYN Stealth Scan at 20:12, 2.02s elapsed (1 total ports)
Host bom01s01-in-f83.1e100.net (209.85.153.83) is up.
Interesting ports on bom01s01-in-f83.1e100.net (209.85.153.83):
PORT STATE SERVICE
25/tcp filtered smtp

Read data files from: /usr/share/nmap
Nmap done: 1 IP address (1 host up) scanned in 2.12 seconds
Raw packets sent: 2 (88B) | Rcvd: 0 (0B)



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#3
February 18, 2011 at 07:10:09
So you tried this?
nmap -v -P0 -p 25 smtp.gmail.com

and you've got
PORT STATE SERVICE
25/tcp filtered smtp

???

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Related Solutions

#4
February 18, 2011 at 07:24:28
yes....

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#5
February 18, 2011 at 07:33:18
Can you ping smtp.gmail.com ?

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#6
February 18, 2011 at 07:55:31
yes.. ping is also working...

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#7
February 18, 2011 at 07:59:39
Again, from a terminal console, you entered:
nmap -v -P0 -p 25 smtp.gmail.com

You get:
ORT STATE SERVICE
25/tcp filtered smtp

But you can ping smtp.gmail.com

Ok, so what's about the pop server of gmail?
There, port 110 should be open.
To check this, use this command from a terminal console:
nmap -v -P0 -p 110 pop.gmail.com

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#8
February 18, 2011 at 08:20:13
result for pop server.......
-nmap -v -P0 -p 110 pop.gmail.com

Starting Nmap 5.00 ( http://nmap.org ) at 2011-02-18 21:47 IST
NSE: Loaded 0 scripts for scanning.
Initiating Parallel DNS resolution of 1 host. at 21:47
Completed Parallel DNS resolution of 1 host. at 21:47, 0.02s elapsed
Initiating SYN Stealth Scan at 21:47
Scanning pw-in-f109.1e100.net (74.125.53.109) [1 port]
Completed SYN Stealth Scan at 21:47, 2.02s elapsed (1 total ports)
Host pw-in-f109.1e100.net (74.125.53.109) is up.
Interesting ports on pw-in-f109.1e100.net (74.125.53.109):
PORT STATE SERVICE
110/tcp filtered pop3

Read data files from: /usr/share/nmap
Nmap done: 1 IP address (1 host up) scanned in 2.13 seconds
Raw packets sent: 2 (88B) | Rcvd: 2 (152B)


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#9
February 18, 2011 at 08:30:54
Oh sorry, just check it by myself.
Port 110 is filtered.
Check the same on port 995.
nmap -v -P0 -p 995 pop.gmail.com

Should give this:
PORT STATE SERVICE
995/tcp open pop3s

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#10
February 18, 2011 at 09:10:19
ya it does..
port state service
995/tcp open pop3s...


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#11
February 18, 2011 at 09:38:19
Hmmm, that's odd.

Try again these to commands:

for smtp:
nmap -v -P0 -p 25 smtp.gmail.com

and for secure smtp:
nmap -v -P0 -p 465 smtp.gmail.com

Report back the results.

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#12
February 18, 2011 at 10:08:25
well......... i tried from putty....
smtp.gmail.com connects but does not allow authorised login.....
perhaps google is blocking telnet access..

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#13
February 18, 2011 at 10:09:55
both ports 25 and 465 give port state service.


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#14
February 18, 2011 at 11:14:30
You don't do telnet, but smtp, when using telnet to port 25.
Telnet uses port 23.

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#15
February 18, 2011 at 20:59:57
ok......
i'm not much experienced in all this....
all i know is i cannot read my mail from smtp.google.com using telnet....

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#16
February 19, 2011 at 04:33:25
Because it's smtp.gmail.com and pop.gmail.com

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