On Tue, Feb 19, 2002 at 10:17:44AM -0500, James Covington wrote:

> Below is an error message which was sent by my installation of Courier, to 
> one of the recipients of a message I sent Sunday.  The message I sent was 
> nothing more than 2 lines of text, and attached text-based .dat file.  The 
> attachment is a compilation of the precipitation reports in my area, for 
> the National Weather Service.  I have sent the same message, simply 
> changing the dates, several times, yet Sunday's yields an error?
> 
> The recipients already received the original message and attachment, the 
> server sent this out almost 48 hours after the message had already been 
> delivered.  Why would this be sent to the recipient, and not the sender?
> 
> I'm using Courier 0.37.2 on RH 7.1.
> 
> >                               CORRUPTED MESSAGE
> >
> >This is the Courier Mail Server 0.37 on mail.spamwhack.com.
> >
> >I received the following message for delivery to your address.
> >Unfortunately,
> >the sender's mail software did not properly format the following message
> >according to Internet mail formatting protocols, and I can only deliver mail
> >which has been properly formatted according to Internet standards.  Instead
> >of returning the following message as undeliverable, it is saved, in its
> >original form, in the following attachment, which you can open with any
> >editor or word processor.
> >
> >Please notify the original sender that their message was not properly
> >formatted by their mail software.  The specific mail protocol error in the
> >original message is as follows:
> >
> >----------------------------------------------------------------------------
> >-
> >The MIME boundary delimiter strings in the following message are ambiguous,
> >and cannot be parsed.
> >
> >See 'IMPLEMENTORS NOTE' in section 5.1.1 of
> ><URL:ftp://ftp.isi.edu/in-notes/rfc2046.txt> for more information.
> >----------------------------------------------------------------------------

1. You sent this message to some recipients on a courier server
2. _Your_ email client generated incorrect MIME boundaries for this message
3. The recipient's courier received the message, but because it was corrupt
(anbigious MIME boundaries), it encapsulated the message into an attachment
for the recipient to deal with.
4. This type of error will not always occur - it occurs intermittently,
with your mail client, so you will see it sometimes, and not other times.
5. Solution? Switch to a better mail client. Courier's behaviour here may
be annoying to you and your recipient, but it is defensive, to protect
courier's IMAP server and other IMAP clients from bad MIME.

-- 
Anand Buddhdev

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