Hi Marco, Do you have a way to approach this scientifically with a well-structured experiment of your own? The data will tell the story for ContactLab’s unique mix of customers and receivers.
Some sophisticated receivers are known to downgrade the reputation of senders who repeatedly attempt to deliver mail to non-existent addresses. They have (floating) thresholds, and those thresholds might be discoverable. Regardless, with the right inbox placement measurement tools, you should be able to observe an effect, if any. At the core, your question is about how to best serve (good) customers by balancing the upside of less-aggressive list pruning vs the downside of lower inbox placement at the subset of receivers who use redelivery signals in their reputation scoring. If the pain your customers are feeling is high, and enough of them are concerned that their lists are shrinking unnecessarily, there might be enough business justification to conduct such an experiment. Perhaps members of this list can share insights about which receivers are known to be particularly sensitive to senders who attempt just 1 or 2 additional retries after they issue a 5XX, and those who don’t. (And here, I presume ContactLab won’t push retries past the CSA-imposed limit of 3.) Paul Kincaid-Smith EmailGrades > On Feb 27, 2019, at 09:16, Marco Franceschetti via mailop <[email protected]> > 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 > [email protected] > Via Natale Battaglia, 12 | Milano > contactlab.com/it > > _______________________________________________ > mailop mailing list > [email protected] > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop _______________________________________________ mailop mailing list [email protected] https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
