Fail to telnet localhost 25
 

Hi folks,

Ubuntu-6.06.1-LAMP-server-amd64

I followed Section "11 Postfix With SMTP-AUTH And TLS" on
http://www.howtoforge.com/perfect_setup_ubuntu_6.06_p5

to config LAMP server. Encountered problem on running;
$ sudo telnet localhost 25Please advise how to fix the problem.

TIA


B.R.
satimis

It's not hanging. It's waiting for you to start giving smtp commands and after a while it just timeouts. After connecting try something like:

Hi bathory,

I got it. It was wasting for my input.

$ sudo /etc/init.d/saslauthd restart
Password:$ sudo telnet localhost 25Tks.


B.R.
satimis

You can use the following smtp commands to send an emailAlways finish your mail with a dot "."

Hi bathory,

Tks for your advice.

I haven't registered a domain yet. How can I perform this test? TIA


B.R.
satimis

Well you can use whatever domain you want (existing or not existing) as yourdomain.com (you can also leave it as is or use localhost) and a valid email address to get the email (replace recipient@otherdomain.com).
But keep in mind that most mailservers do not accept mail from a host who's IP does not resolve to a domain. So you can test it locally (i.e send an email from you to yourself).

Hi bathory,

Performed 2 tests as follows;

1)
$ telnet localhost 25Failed.


2)
$ sudo telnet localhost 25
Password:Also failed

Furthermore sending a email to myself I still have to going through ISP. I think I have to register a free domain to continue this test.

Tks.

B.R.
satimis

After the dot that end the mail data you must give quit to quit the telnet session.
Instead of rcpt to: satimis@abc.com (I guess it's not real), why don't you use rcpt to: satimis@localhost to see if you can send/receive locally (assuming the user satimis exists) and use whatever account you have in webmail services like gmail, hotmail etc to see if you can send outside your box.

Hi bathory,

Further test;

$ telnet localhost 25$ nano /var/mail/satimis

Yes I received the mail.


Also sent it to webmail a/c on yahoo.com. But up to the time of writing I haven't received it.


Others noted with tks.


B.R.
satimis

Most likely you're not going to receive it since your IP must resolve to a valid hostname. If that's not true the other mailserver rejects the message to prevent spam.

Regards

Yes, Yahoo is picky. To see yourself what your mailer is encountering, you can talk to them just like you talk to your own SMTP server:
Normally you get "Message temporarily deferred", and the door slammed in your face. It's not really temporary -- it'll never work. See http://help.yahoo.com/help/us/mail/defer/defer-06.html
To fix, go to http://add.yahoo.com/fast/help/us/mail/cgi_defer and tell them your IP address is not "naughty". Yes, they take your word for it. Since I told then that my IP was "nice", their SMTP server has been polite, and I just sent myself a mail.

You reported this experiment:
"Subject" should be capitalized. And there should be an empty line between the headers (Subject, Date, From, To, ...) and the body of the message.

Hi Quigi,

Tks for your advice.

Performed 2 tests as follows;

1)
$ telnet a.mx.mail.yahoo.com 25$ whois 209.191.118.103The IP address is Yahoo.


2)
without "a.mx."

$ telnet mail.yahoo.com 25$ whois 209.73.168.74The IP address is AltaVista Company.

What is "a.mx."?

Sent Yahoo following info;An acknowledge webmail was received from Yahoo.


Sent myself a webmail as follow;

$ telnet localhost 25But the webmail never come. I have been waiting for more than half hour. Just checked Yahoo website before answering this thread.

Others noted with Tks


B.R.
satimis

Noted with tks.

I suppose your advice sending mails is the backend. The front end software will be evolution, thunderbird, etc.? Tks.


B.R.
satimis

It seems that you cannot even establish a connection. That's not what I get from Yahoo. Possibly you ISP is blocking port 25? (Some are nasty.) Try any other host (non Yahoo). You have to fix this first.

You changed the name. By chance, there happens to be a host "mail.yahoo.com".
That's indeed odd, but don't worry about it.
Arbitrary substring of the hostname :) You cannot pick it apart like that. (Apart from domain ownership/delegation considerations below yahoo.com, which shouldn't bohther you.)
But you may wonder how I got the name. Here's how:
1) You want to send mail to, say, "satimis@yahoo.com"
2) The mail domain is the part after the '@', i.e., "yahoo.com".
3) Find which hosts handle mail for that domain:
4) Pick one of the results. Not sure, but I think lower score is "better", i.e., what the owner of the MX records prefers you to use. Out of the 8 answers that I got for "yahoo.com", I picked "a.mx.yahoo.com"
5) To send mail, carry an SMTP dialog (port 25) with that host.


An IP address is four bytes, usually written as dotted (decimal) quad, e.g., 66.45.232.66.

If you cannot connect to Yahoo's, it's unlikely

Hi Quigi,

Now I have "satimis.homelinux.com", a free domain with dynamic IP, registered with dyndns.org.

I suppose my email address there is "satimis@satimis.homelinux.com". If I'm wrong please correct me.

Performed another test as follow:

$ telnet localhost 25The email never arrived.

$ host -t mx writeme.com$ telnet writeme-com-bk.mr.outblaze.com 25it only hanging here.

How to check whether port 25 is blocked by ISP? If YES how to by-pass this blockage? Tks.

I suppose I have to change them as;I haven't sent them yet. I have to sort out "port 25" problem first.

Tks.


B.R.
satimis