What is Postfix?

This is an example message that sometimes appears in my mailbox. I know
nothing about postfix except that sometimes it appears to reject mail that I
send out. I've gone to the postfix webpage but I am still wondering what is
causing this, my end or their end, or both and what can I do to put a stop
to it? Which postmaster am I supposed to write to....theirs or mine? Where
does safepages.com fit into this? The addresses I send to are never
safepages.com The rejections seem to come when they feel like it. Most of
the time the email goes through. What gives? Is this some kind of
experiment or something being developed as it goes along? Is there a virus
or worm involved?

The message:

This is the Postfix program at host mail11.mdx.safepages.com.

I'm sorry to have to inform you that your message could not be
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The Postfix program

<###########@juno.com>: host mx.nyc.untd.com[64.136.20.83] said: 550
###########@juno.com Account Inactive (in reply to RCPT TO command)

On Mon, 20 Dec 2004 15:28:45 -0700, zeus <zeus@notme.sp> wrote:
> This is an example message that sometimes appears in my mailbox. I know
> nothing about postfix except that sometimes it appears to reject mail that I
> send out. I've gone to the postfix webpage but I am still wondering what is
> causing this, my end or their end, or both and what can I do to put a stop
> to it? Which postmaster am I supposed to write to....theirs or mine? Where
> does safepages.com fit into this? The addresses I send to are never
> safepages.com The rejections seem to come when they feel like it. Most of
> the time the email goes through. What gives? Is this some kind of
> experiment or something being developed as it goes along? Is there a virus
> or worm involved?
>
> The message:
>
> This is the Postfix program at host mail11.mdx.safepages.com.
>
> I'm sorry to have to inform you that your message could not be
> be delivered to one or more recipients. It's attached below.
>
> For further assistance, please send mail to <postmaster>
>
> If you do so, please include this problem report. You can
> delete your own text from the attached returned message.
>
> The Postfix program
>
><###########@juno.com>: host mx.nyc.untd.com[64.136.20.83] said: 550
> ###########@juno.com Account Inactive (in reply to RCPT TO command)

Well since you dont seem to have noticed, look at the very last line
the account at juno you are mailing is inactive, presumably it has not been
used for some time... you could try snail mail or phone as an alternative

--
Martin