Re: ListServ MLM refuses Squirrelmail plain text messages

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On 2018年05月24日 12:14, James B. Byrne via squirrelmail-users wrote:
> On Thu, May 24, 2018 14:40, James B. Byrne wrote:
>> Starting this morning (2018-05-2) my Squirrelmail (SM) composed posts
>> to a Listserv mailing list service are being bounced back with this:
> . . .
>> Does anyone have a clue as to what is happening and how it is
>> resolved?
> The temporary fix is to attach an empty or proforma content file to
> the message and send.  This causes the missing header to be created:
> Content-Type: text/plain; charset="iso-8859-1"

This header is not the cause.  It's a problem with one of the servers in
the receiving chain not supporting 8-bit MIME messages while the initial
server indicates that it has 8-bit MIME support.  Not a SquirrelMail
issue in any way, shape or form.!topic/

$ telnet 25
Connected to
Escape character is '^]'.
220 Microsoft ESMTP MAIL Service
ready at Thu, 14 Jun 2018 09:29:15 +0000
EHLO Hello [111.222.333.444]
250-SIZE 157286400

James, in your specific example, the mail goes through several hops, all
of which seem to be hosted by Microsoft's servers, and I suspect those
are probably OK.  The last hop is to the organization hosting the
mailing list and it's probably the culprit - probably an older or
misconfigured Exchange server or the likes.  I tried to telnet to it to
test its greeting but it would not talk to me.

Paul Lesniewski
SquirrelMail Team
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