Email sent to me by Dreamhost.

Some of you have written in with concerns about emails being sent from
your domain that
contain misleading "From" headers and body text that implies it's coming
 from your
domain, or from a dreamhost.com domain name. These emails also contain
attachments
ending in the extension ".zip", ".pif", or ".exe".

Almost certainly, these messages are the result of the W32.Beagle.K@mm
virus, or a
variation thereof. You can learn more about this virus here:

http://www.sarc.com/avcenter/venc/data/w32.beagle.k@mm.html

In short, the virus contains an SMTP engine that allows it to send email
 from the infected
person's computer, using forged headers and content to make it more
likely for the
recipient of such email to open and execute the included attachment (which
 is a copy of the
virus itself). The virus infects most Microsoft Windows-based machines,
though the
message may be received by those using other platforms (ie. Mac OS, Mac
OS X, Unix,
Linux, etc).

Many viruses these days use similar techniques to distribute themselves
and infect others.

If you receive such an attachment, delete it immediately. Unfortunately,
 there is no way to
stop such messages from being sent in the first place as it is being
sent from a 3rd party's
infected computer. There is no need to contact support unless you have
other questions.

If you have opened such an attachment, we recommend installing a current
 version of
Norton Anti-Virus, updating it with the latest virus definitions, and
having it remove the
virus from your computer (if it exists). Having such a tool is also
considered a Good Idea?
in general.

...

If you are concerned about email viruses in general, we provide the
following
recommendations:

- Purchase and install a virus scanner on your computer (such as Norton
Anti-Virus), and
keep it updated monthly with the latest virus definitions. An outdated
virus scanner is only
slightly more useful than no virus scanner at all.

- Do not open attachments from unknown email addresses, and always be
careful of
any attachments found in strangely worded messages - even from known
email addresses.

- If you are a Windows user, consider not using Microsoft Outlook or
Outlook Express, as it
is rather insecure in the face of such viruses (and many viruses
specifically rely on it to
spread). If you still wish to use it, be sure that you have the latest
version installed as
improvements have been made.