On 11/01/2012 00:31, Mail Lists wrote:

On 01/10/2012 05:54 PM, Giles Coochey wrote:

...

Hi All,

I have set up three servers in a development environment. Via CR they're updated to Centos 6.2

It appears that these servers have postfix installed on them by default, which unfortunately I'm not very well acquainted with.

All I want is a quick and dirty way to enable these hosts to send email through my own SMTP host.

My (sendmail) SMTP host uses SMTP AUTH on a non-standard port and my dev (virtual env) runs off my laptop, so a dynamic IP.

Does anyone have a quick and dirty configuration for setting up postfix to forward all remote mail through my smarthost?

I'm guessing that I can put the hostname, the port, and the username and password somewhere in the postfix configuration and it will just work...

/etc/postfix

Edit main.cf



 I would recommend reading up on the configurations .

I don't really have the enerygy to do that, thanks anyway. I'll uninstall postfix and use sendmail. Just thought maybe there was a quick way to keep the default MTA on the system.

On Wed, January 11, 2012 10:09, John R Pierce wrote:

On 01/11/12 12:50 AM, Giles Coochey wrote:

...

I don't really have the enerygy to do that, thanks anyway. I'll uninstall postfix and use sendmail. Just thought maybe there was a quick way to keep the default MTA on the system.

the first google hit on 'postfix smarthost' says to change/add the line

 relayhost = your.server.com

to the main.cf file, and restart postfix... seems simple enough.

this is the 2nd or third hit, it expounds on that and shows how to setup SASL authentication with the smarthost... http://www.cyberciti.biz/faq/postfix-smtp-authentication-for-mail-servers/

I forgot to mention that I had already googled. My smarthost doesn't use SASL, just STARTTLS - I have tried all those options to no avail.. Perhaps some combination of options might work... but which... I was just hoping someone else had done this before.

On 11/01/2012 10:33, Benjamin Hackl wrote:

$ cat /etc/postfix/main.cf myorigin=yourdomain.com relayhost=your.smarthost.com smtp_sasl_auth_enable=yes ## you probably want to limit how postfix authenticates # smtp_sasl_security_options=noanonymous # smtp_sasl_mechanism_filter=login smtp_sasl_password_maps=hash:/etc/postfix/relay_password ## if something doesn't work and you need detailed(!!) logs #debug_peer_list=your.smarthost.com #debug_peer_level=3 smtp_use_tls=yes #inet_interfaces = loopback-only #local_transport = error: disabled unknown_local_recipient_reject_code = 450

This is very much nearly what I got to. Note though that outbound port 25 is blocked, but my smarthost listens on the submission port as well if auth is used. So my relayhost line says:

relayhost=my.smarthost.com:587

On my relayhost maillog I can see the connection appears, but mails are bounced with:

530 5.7.0 Authentication required (in reply to MAIL FROM command)

$ cat /etc/postfix/relay_password your.smarthost.com yourusername:yourpassword

I have tried my.smarthost.com username:password

and

[my.smarthost.com]:587 username:password

and

my.smarthost.com:587 username:password

With various entries in main.cf to co-incide with these... (and remembering to run postmap each time).

$ postmap /etc/postfix/relay_password $ service postfix reload

You can check out the commented option in the man pages or http://www.postfix.org/postconf.5.html if you're interested later/have some spare time/if it doesn't work ;-)

The line I get in the logs on my smarthost is:

Jan 11 18:31:35 gate sendmail[17441]: STARTTLS=server, relay=188.29.xxx.xxx.threembb.co.uk [188.29.xxx.xxx], version=TLSv1/SSLv3, verify=NO, cipher=DHE-RSA-AES256-SHA, bits=256/256

The mail just bounces back to the sender, nothing else on the smarthost logs.