Hey Alessio- Please contact me off list.
Thanks! *Lili Crowley* she/her Postmaster <http://www.yahoo.com/> On Mon, Sep 21, 2026 at 3:47 AM Alessio Cecchi via mailop <[email protected]> wrote: > Hi, > > We are Qboxmail, an Italian mailbox hosting provider. We provide only > B2B mailboxes exclusively to companies and do not offer free email > accounts. > > I am writing here because I need your help with a deliverability issue > affecting Yahoo mailboxes. Starting from September 17th all our SMTPs > were blocked by Yahoo: > > status=bounced (host mx-eu.mail.am0.yahoodns.net[188.125.72.73] said: > 553 5.7.2 [TSS09] All messages from 185.97.217.40 will be permanently > deferred; Retrying will NOT succeed. See > https://postmaster.yahooinc.com/error-codes (in reply to MAIL FROM > command)) > > dsn=5.7.2, status=bounced (host mta7.am0.yahoodns.net[67.195.204.74] > said: 553 5.7.2 [TSS09] All messages from 185.97.217.41 will be > permanently deferred; Retrying will NOT succeed. See > https://postmaster.yahooinc.com/error-codes (in reply to MAIL FROM > command)) > > dsn=5.7.2, status=bounced (host mta6.am0.yahoodns.net[98.136.96.74] > said: 553 5.7.2 [TSS09] All messages from 185.97.217.43 will be > permanently deferred; Retrying will NOT succeed. See > https://postmaster.yahooinc.com/error-codes (in reply to MAIL FROM > command)) > > All our IPs 185.97.217.0/24 seems blocked by Yahoo. > > I filled out the support form on their website, but nothing has changed. > > It’s very strange because we’re only having this problem with Yahoo; our > IPs aren't on any other major blocklists. > > We’re facing serious issues because of this block. > What can we do? > Thanks > > -- > Alessio Cecchi > postmaster AT qboxmail > > https://urldefense.com/v3/__https://it.linkedin.com/in/alessice__;!!Op6eflyXZCqGR5I!DMMwntFKTt8wqg28wCOqkOIb3MW9GP7y59wvzvosWznMUYYSuaOraRE6VWwGVx08rP1yx5PRVz8H84ex6p0$ > > _______________________________________________ > mailop mailing list > [email protected] > > https://urldefense.com/v3/__https://list.mailop.org/listinfo/mailop__;!!Op6eflyXZCqGR5I!DMMwntFKTt8wqg28wCOqkOIb3MW9GP7y59wvzvosWznMUYYSuaOraRE6VWwGVx08rP1yx5PRVz8H9Q-ATbY$ >
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