FWIW, I've had a similar experience recently trying to subscribe to a
mailing list that used a similar confirmation system.  If I use entourage x
to send the mail, the mail gets bounced back with the same error that Paul
is getting.  If I send it with another email client, it goes through without
issue.

Robert Occhialini



On 4/24/02 10:23 AM, "Paul Berkowitz" <[EMAIL PROTECTED]> wrote:

> In my case, Entourage didn't refuse to send it, but I got back a message
> from my own ISP's mail (SMTP, I guess) server a few seconds after:
> 
> ----- The following addresses had permanent fatal errors -----
> <list-digest-uc.1019616783.dghciokgedlcdlnchgpo-julianv=mindspring.com@abc-x
> yz.net>
>   (reason: 550 Host unknown)
> 
> My guess would be that the absurd length of the address has introduced a
> carriage return which makes it invalid even with the < > around it. It's
> splitting the domain between two lines. Apple's Mail, either because it's
> based on .rtf instead of text and may not introduce a return character at
> all, or more likely because it's Unix-based and may be introducing LF
> linefeeds which don't bother our SMTP servers, may not be hitting that
> problem. I'd be extremely surprised to find out that a user name (before the
> @ sign) of more than 70 characters is valid. I'm sure its invalid and
> whatever idiot dreamed it up should be fired from his job. Are you certain
> that the message sent from Mail actually got where it was supposed to be
> going, even if it didn't get rejected by the SMTP server?


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