Port 25 and Static/Dynamic IP for Listserve SW

[Piper]

Thank you for explaining these expressions.

Perhaps others know:

Can the port 25 and "dynamic ip" problem be avoided in configuring either 
Majordomo or Mailman?
Or am I back to asking for some new code added to Evolution?

How should I instruct my computer shop?

----- Original Message ----- 
From: "Aart Koelewijn" <aart at mtack.xs4all.nl>
To: <ubuntu-users at lists.ubuntu.com>
Sent: Thursday, July 16, 2009 11:26 AM
Subject: Re: I want better email SW. Can Evolution/Majordomo deliver?


> On Thu, 16 Jul 2009 10:23:17 -0700, Piper wrote:
>
>>  Can anyone elaborate on what port 25 is or why Majordomo as a private
>> listerver would smell like DSL spam?
>>
>>
> Port 25 is the port usually used for email traffic to and between Mail
> Transfer Agents (MTAs). Many Internet Service Providers (ISPs) block all
> traffic on this port except for the traffic to their own MTAs. In this
> way they can get a better grip on spam and can catch anyone trying to
> send spam.
>
> Many DSL users have a dynamical allocated ip. An official MTA never has a
> dynamical allocated ip. Most spam is send from user accounts who often
> have a dynamical allocated ip. Ranges of dynamical allocated ip's are
> well known. In an effort to prevent spam mail from userrs a dynamical
> allocated ip is often blocked by MTAs, except from the MTA from the ISP
> who has users in this range of ip's.
>
> For this reason, if either your ISP blocks port 25 and/or you have a
> dynamic ip it can be impossible for you to send mail directly, you will
> always have to send it trough the MTA of your provider, he then will
> deliver it to the MTA of the ISP of the adressee.
>
> Now I don't know the mailinglist software mentioned in this tread, I have
> a static ip and my ISP does not block port 25, I run my own MTA and
> deliver directly to the MTA of the ISP of the addressee, but it seems
> quite likely mailinglist software will have to be set-up in a special way
> if either port 25 is blocked and/or you have a dynamic ip.
>
> -- 
> Aart
>
>
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