Results 1 to 2 of 2

Thread: Using Telnet to send mail to local address

  1. #1
    amnz is offline Active Member
    Join Date
    Apr 2006
    Location
    Barcelona (SPAIN)
    Posts
    35
    Rep Power
    9

    Default Using Telnet to send mail to local address

    I know there is a flag on SMTP that leaves you send mail trough a server using Telnet login on port 25.
    On my zimbra server i cannot send to a foreign address (because relay in blocked), but i can send to an internal (existing) mail address (and if this is a distribution list...then i can send to foreign addresses...)

    For example:
    -------------------------------------
    telnet mail.myserver.com 25
    Trying x.x.x.x
    Connected to mail.myserver.com.
    Escape character is '^]'.
    220 mail.myserver.com ESMTP Postfix
    HELO abc
    250 mail.myserver.com
    MAIL FROM:
    250 2.1.0 Ok
    RCPT TO:
    250 2.1.5 Ok
    DATA
    354 End data with .
    Subject: Test
    Hello.
    .
    250 2.0.0 Ok: queued as A8999999999
    QUIT
    221 2.0.0 Bye
    Connection closed by foreign host.
    -------------------------------------

    Doing this (from anywhere you want... local lan, outside...), the user ANYEXISTINGADDRESS@myserver.com receives an internal mail from anyaddress@myserver.com...

    As i said, I know tha this is the way smtp works (if the RCPT TO is inside the local server, the mail will be delivered). But, is there any way to lock/disable this for outside connections?

  2. #2
    uxbod's Avatar
    uxbod is offline Moderator
    Join Date
    Nov 2006
    Location
    UK
    Posts
    8,017
    Rep Power
    24

    Default

    Search the forums for spoofprotection

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. mta to not starting
    By cowanpf in forum Installation
    Replies: 2
    Last Post: 10-05-2009, 04:36 AM
  2. zmamavisdctl stopped and won't restart
    By alto in forum Installation
    Replies: 2
    Last Post: 04-18-2008, 12:41 AM
  3. [SOLVED] Mailserver down when send file attach of 50Mb
    By ZMilton in forum Administrators
    Replies: 20
    Last Post: 04-10-2008, 11:44 AM
  4. Replies: 20
    Last Post: 03-18-2008, 05:37 AM
  5. fatal: Queue report unavailable - mail system is down
    By zzzzsg in forum Administrators
    Replies: 16
    Last Post: 08-24-2006, 02:31 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •