[nflug] RHEL 5.1/PostFix Refusing Remote Connections

[eric at bootz.us]

Not sure if this was talked about...

Set SELinux to permissive or turn it completely off.  Happens all the  
time when ever I install a new email system running the redhat builds



Quoting Robert Meyer <meyer_rm at yahoo.com>:

> Make sure that IPTables isn't filtering port 25.  Many installations  
>  by default install a firewall package that filters all incoming   
> traffic.  You would expressly have to open any port you wanted the   
> machine to listen on.  Depending on your distribution, you may find   
> /etc/init.d/iptables set up to run when the machine boots.  By   
> default, it installs a block all incoming rule.
>
> Hope this helps...
>
> Cheers!
>
> Bob
>
> --
> "When once you have tasted flight, you will forever walk the earth   
> with your eyes turned skyward, for there you have been, and there   
> you will always long to return."
>    --Leonardo da Vinci
>
> ----- Original Message ----
> From: Robert Wolfe <robertwolfe at localnet.com>
> To: nflug at nflug.org
> Sent: Wednesday, December 26, 2007 3:29:59 PM
> Subject: Re: [nflug] RHEL 5.1/PostFix Refusing Remote Connections
>
>
> Erek Dyskant wrote:
>> Robert,
>>     Your ISP is probably filtering port 25 outside of their network,
>  as
>> ISPs have had so many problems with open relays sucking up all their
>> bandwidth.  Sadly to run a mail server these days one generally needs
>  to
>> have a dedicated server or a business-class connection these days.
>>     Call your ISP to ask what ports they filter, and see if there's
>  any way
>> you can convince them you know what you're doing (if your ISP is
>> localnet you may be in luck <grin>)
>>     Best of luck.
>>
>> --Erek
>>
>
> Actually, if I switch over to my Windoze-based mail server, SMTP
>  traffic
> flows just fine over port 25.
>
> --
> Robert Wolfe
> Systems Administrator
> LocalNet Corp.
> CoreComm Internet Services
> (517) 664-8924
>
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