Hi Emre, My 5xx bounce rate is around 0.2% for these domains. The domains have not gone inactive. Some spam filters reply with such 5xx errors to fend off spam. I haven't seen that @orange yet (but a large Belgium provider does it infrequently).
@Philip (and Mathieu): The point that Emre is making is: - You send to e.g. a 1000 recipients one week. These recipients download images and click on links (e.g. 40% open rate and 5% click rate). Conclusion: Recipients are real and active. - The next week *all* these recipients suddenly bounce and are deactivated on his lists due to a "550 5.1.1 Adresse d au moins un destinataire invalide. Invalid recipient. OFR_416 [416]"... Across all customers. That is not how normal recipients, people, stop using their email accounts. Not at such rates. Some other process is going on. One would like to find out what happened. He is asking himself if the domain has gone out of business (which is not the case). Yours, David On 5 July 2018 at 13:51, Suresh Ramasubramanian <ops.li...@gmail.com> wrote: > For a 1990s throwback, here is the website for xmailserver > > http://www.xmailserver.org/ > > On 05/07/18, 4:56 PM, "mailop on behalf of Benoit Panizzon" < > mailop-boun...@mailop.org on behalf of benoit.paniz...@imp.ch> wrote: > > Hi Erme > > I've seen similar problems with ISP using, as I recall, something > sounding like 'xmailserver' as SMTP Server. > > That Server has a very serious bug, instead of rejecting invalid > recipients during the 'rcpt to' handshake, it does this after 'data' > has been initiated by issuing a human readable message telling what > recipient was invalid. > > This of course breaks all mailing lists or newsletter tools which send > emails to as many recipients as possible to lower resource consumption. > > If one destination address becomes invalid, this leads to mass > unsubscription of valid email addresses on tools like mailman. > > So Maybe France Telecom switched to such a mailserver? > > Mit freundlichen Grüssen > > -Benoît Panizzon- > -- > I m p r o W a r e A G - Leiter Commerce Kunden > ______________________________________________________ > > Zurlindenstrasse 29 Tel +41 61 826 93 00 > CH-4133 Pratteln Fax +41 61 826 93 01 > Schweiz Web http://www.imp.ch > ______________________________________________________ > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop > > > > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop > -- -- My opinion is mine.
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