Thanks again and cheers
Michael Am 12.12.2023 um 10:56 schrieb Tobias Herkula via mailop:
This seems to be an issue on your site, I checked the logs and all the times we were not able to deliver mails to you the error we had was "temporary mx resolver error". Most likely root cause: "dns.hiskp.uni-bonn.de." does not answer queries via UDP, as you also have a couple of more systems answering fine, this would also explain why it sometimes works and sometimes not. / Tobias Herkula Senior Product Owner Mail Security Product Management Mail Transfer & Mail Security 1&1 Mail & Media GmbH Hauptsitz Montabaur, Amtsgericht Montabaur, HRB 7666 Geschäftsführer: Alexander Charles, Dana Kraft, Thomas Ludwig, Dr. Michael Hagenau Member of United Internet Diese E-Mail kann vertrauliche und/oder gesetzlich geschützte Informationen enthalten. Wenn Sie nicht der bestimmungsgemäße Adressat sind oder diese E-Mail irrtümlich erhalten haben, unterrichten Sie bitte den Absender und vernichten Sie diese E-Mail. Anderen als dem bestimmungsgemäßen Adressaten ist untersagt, diese E-Mail zu speichern, weiterzuleiten oder ihren Inhalt auf welche Weise auch immer zu verwenden. This e-mail may contain confidential and/or privileged information. If you are not the intended recipient of this e-mail, you are hereby notified that saving, distribution or use of the content of this e-mail in any way is prohibited. If you have received this e-mail in error, please notify the sender and delete the e-mail. -----Original Message----- From: mailop <mailop-boun...@mailop.org> On Behalf Of Michael Lang via mailop Sent: Tuesday, December 12, 2023 8:50 AM To: mailop@mailop.org Subject: [mailop] "451 Requested action aborted: local error in processing" when submitting email to ionos email services. Hi everybody, for approximately one year, we are receiving regular complaints from remote contacts having problems to ship email from a service like gmx.de, gmx.net, 1und1.de and similar in fact services hosted by ionos to our email domain (@hiskp.uni-bonn.de, MX=mx8.hiskp.uni-bonn.de). During submission of ionos customers to one of the ionos servers people eventually receive an error of type: 451 Requested action aborted: local error in processing We tried to track this error on our own and found out that this warning randomly appears and if a resubmit is tried a few seconds later, submission via ionos services works flawlessly. Guessing that this might be caused by the MX entry for our destination getting lost in the cache of ionos submission servers due to a to short TTL, we tried changing that in our DNS, but this did not change the scenario. We furthermore observed that mail systems obviously receiving heavier load than we do seem not to have this problem or it occurs very rarely. Anyway that is for now a wild guess from us. To us this appears as if the timeout checking DNS for the MX + A / AAAA records is too short, independant ot the TTL and it furthermore appears to be load dependant on the ionos servers. The same phaenomenon we regularly observe when mail from our site is shipped to ionos servers. Here emails regularly get deferred for several seconds with the same 451 error but are successfully acepted with code 250 a few seconds later. As access to intermediate and top layer domain servers is obviously beyond our administrational range, does anybody have an idea why this occurs really? Is there maybe a contact at ionos to subscribe our email service for flawless transport, such as e.g. at t-online.de? Is this problem known to anybody else and what did you do to fight it? With kind regards Michael _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
BEGIN:VCARD VERSION:4.0 N:Lang;Michael;;; FN:Michael Lang EMAIL;PREF=1;TYPE=work:ml...@hiskp.uni-bonn.de TITLE:Dr. ORG:Rheinische Friedrich-Wilhelms-Universität Bonn;Helmholtz-Institut für Strahlen- und Kernphysik URL;TYPE=work:https://www.hiskp.uni-bonn.de ADR;TYPE=work:;;Nußallee 14-16;Bonn;NRW;53115;Deutschland TEL;TYPE=work;VALUE=TEXT:+49 228 73-2522 TEL;TYPE=fax;VALUE=TEXT:+49 228 73-2505 TZ:Europe/Berlin END:VCARD
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