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. https://clintboessen.blogspot.com/2011/10/smtp.html https://knicksmith.blogspot.com/2007/07/ndr-message-561-body-type-not-supported.html https://groups.google.com/forum/#!topic/microsoft.public.exchange.admin/DZE9Hkd-Dvc https://www.roundcubeforum.net/index.php?topic=6276.0 https://social.technet.microsoft.com/Forums/office/en-US/89abe56e-bebf-4b66-b235-9bbd3efb02fa/body-type-not-supported-errors?forum=exchangesvradminlegacy https://johanveldhuis.nl/554-561-body-type-not-supported-by-remote-host/ http://forums.msexchange.org/Body_type_not_supported_by_Remote_Host/m_10083700/tm.htm $ telnet outlook.com 25 Trying 40.97.153.146... Connected to outlook.com. Escape character is '^]'. 220 BN6PR2001CA0009.outlook.office365.com Microsoft ESMTP MAIL Service ready at Thu, 14 Jun 2018 09:29:15 +0000 EHLO example.com 250-BN6PR2001CA0009.outlook.office365.com Hello [111.222.333.444] 250-SIZE 157286400 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-STARTTLS 250-8BITMIME 250-BINARYMIME 250-CHUNKING 250 SMTPUTF8 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 Please support Open Source Software by donating to SquirrelMail! http://squirrelmail.org/donate_paul_lesniewski.php ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot ----- squirrelmail-users mailing list Posting guidelines: http://squirrelmail.org/postingguidelines List address: squirrelmail-users@xxxxxxxxxxxxxxxxxxxxx List archives: http://news.gmane.org/gmane.mail.squirrelmail.user List info (subscribe/unsubscribe/change options): https://lists.sourceforge.net/lists/listinfo/squirrelmail-users
