LinuxQuestions.org
LinuxAnswers - the LQ Linux tutorial section.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Software
User Name
Password
Linux - Software This forum is for Software issues.
Having a problem installing a new program? Want to know which application is best for the job? Post your question in this forum.

Notices

Reply
 
Search this Thread
Old 01-28-2004, 05:49 PM   #1
darklogik_org
Member
 
Registered: Jan 2004
Distribution: freebsd 5.3, openbsd 3.6, slackware 10
Posts: 96

Rep: Reputation: 15
Postfix - Open relay or not?


I was led to believe that a default install of postfix, configured with nothing but your hostname and domain name will not be an open relay. I can telnet to port 25 on localhost and manually send mail with HELO, MAIL, RCPT etc. What's to stop other people doing this when I open up the server to the world?

mark
 
Old 01-28-2004, 07:47 PM   #2
jtshaw
Senior Member
 
Registered: Nov 2000
Location: Seattle, WA USA
Distribution: Ubuntu @ Home, RHEL @ Work
Posts: 3,892
Blog Entries: 1

Rep: Reputation: 66
The smtp server should only deliver mail to the local machine unless the mail is from the local machine.

Of course you can also implement SMTP Authentication which would allow deliver of mail to outside machines if it comes in from an authenticated user.
 
Old 01-29-2004, 05:30 AM   #3
darklogik_org
Member
 
Registered: Jan 2004
Distribution: freebsd 5.3, openbsd 3.6, slackware 10
Posts: 96

Original Poster
Rep: Reputation: 15
Thanks, that puts my mind at rest. I was going to spend today implementing SASL authentication, but I wanted to make sure it was quite safe in the mean time.

cheers
mark
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
[Postfix/SMTPD] Getting no AUTH from server; open relay superhausi Linux - Security 2 11-19-2008 05:37 PM
Spam, PostFix, OPen Relay question linchat Linux - Software 1 09-15-2005 03:22 PM
Postfix as a mail relay (getting relay access denied) hypexr Linux - Software 3 09-13-2005 07:15 PM
closing a postfix open relay behind a NAT mishunimi Linux - Networking 2 02-05-2004 06:32 PM
How to avoid making postfix setup an open relay??! lucastic Linux - Software 16 11-11-2003 11:38 AM


All times are GMT -5. The time now is 06:20 AM.

Main Menu
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration