Home / server / Questions / 238038
In Process
codeomnitrix
Asked: 2011-02-21 20:56:00 +0800 CST

unable to connect gmail and hotmail via telnet

  • 772

Hey all i am try to connect to gmail and hotmail server via telnet.

As:

$: telnet smtp.gmail.com 25
Trying 74.125.127.109...
Connected to gmail-smtp-msa.l.google.com.
Escape character is '^]'.
220 mx.google.com ESMTP j3sm3044317ybe.11
helo
250 mx.google.com at your service
220 2.0.0 Ready to start TLS
mail from: [email protected]
Connection closed by foreign host.

Here codeomnitrix is a user of smtp.localhost.com. And i am running postfix at my system with sitename being smtp.localhost.com.

And i am able to sent mail locally from one user to another user but can't send to any other user who is not local.

Thanks in advance:)

smtp postfix gmail

3 Answers

  1. The reason telnet isn't working is because Google is now requiring ESMTP (EHLO verb, not HELO) and TLS. Telnet is now broken. You can use openssl, though.

    openssl s_client -starttls smtp -crlf -connect smtp.gmail.com:25

    The normal SMTP commands should work from there.

    • 4

  2. Why are you trying to connect to smtp.gmail.com? The MX for domains using google apps is aspmx.l.google.com and the MX for gmail.com is gmail-smtp-in.l.google.com. Are you trying to use Gmail as a mail relay for your computer, or trying to deliver to a Google Apps mail/gmail.com account?

    aspmx.l.google.com does not require STARTTLS like smtp.gmail.com does, as it's an MX, not a mail submission point.

    Also - what you pasted is invalid SMTP. You need angle brackets around the e-mail address in a MAIL FROM. Some SMTP servers might accept it, but Gmail won't.

    $ telnet aspmx.l.google.com 25
Trying 74.125.53.27...
Connected to aspmx.l.google.com.
Escape character is '^]'.
220 mx.google.com ESMTP v8si11328246ybe.52
helo
250 mx.google.com at your service
mail from: [email protected]
555 5.5.2 Syntax error. v8si11328246ybe.52
MAIL FROM: <[email protected]>
250 2.1.0 OK v8si11328246ybe.52
    • 1

  3. @codeomnitrix, please try to type the command in capital letters i.e :

    RCPT TO: <[email protected]>
    • -1