We (web.de<http://web.de>, GMX, mail.com<http://mail.com>) are clear in our response.
We state if recipient mailbox either not exists "5xy Requested action not taken: mailbox unavailable“ or is out of storage "5xy Requested mail action aborted: exceeded storage allocation, Quota exceeded“. If you do not stop sending to unavailable mailboxes we’ll block you sooner than later. We also state this in our mail policy: https://postmaster.web.de/en/email-policy Best regards Arne Arne Allisat Head of Mail Application Security Product Management Applications 1&1 Mail & Media GmbH | Brauerstraße 48 | 76135 Karlsruhe | Germany E-Mail: arne.alli...@1und1.de<mailto:arne.alli...@1und1.de> | Web: www.1und1.de<http://www.1und1.de/> Am 27.02.2019 um 22:01 schrieb Maarten Oelering <maar...@postmastery.com>: Hi Marco, I am curious what false positives you encountered. We suggest to classify bounces using multiple features, the text, the enhanced status code, and the status code. If the bounce is clearly an invalid address, then remove it after the first bounce. For example when the text contains “mailbox” or a synonym, and “unknown” or a synonym. Bounces which are ambiguous, or with inconsistent features should be treated as soft bounce. Maarten Postmastery On Wed, 27 Feb 2019 at 17:27, Marco Franceschetti via mailop <mailop@mailop.org<mailto:mailop@mailop.org>> wrote: Hello, We at contactlab are considering a change in the deactivation of hard bounces. Currently, we suppress not existing mailboxes at the first hit. We are aware of a small percentage of false positives. Recent admissions criteria for Certified Senders states: "The CSA sender must take email addresses from mailing lists, if, after sending to this address, the mailbox is identified as non-existent; at the latest, however, this must occur after three hard bounces". We are evaluating to remove not existing mailboxes from the lists of our clients after the second hit instead of the first one. Do you have any considerations, suggestions about this? Marco Marco Franceschetti Head of Deliverability | ContactLab marco.francesche...@contactlab.com<mailto:marco.francesche...@contactlab.com> Via Natale Battaglia, 12 | Milano<https://maps.google.com/?q=Via+Natale+Battaglia,+12+%7C+Milano&entry=gmail&source=g> contactlab.com/it<http://contactlab.com/it> _______________________________________________ mailop mailing list mailop@mailop.org<mailto: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
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