Hi, We are observing the same bounces, but things seem to be improving since 11:41 a.m. (CEST). Best, Pierre-Yves Dubreucq
On Thu, Feb 12, 2026 at 10:33 AM Hans-Martin Mosner via mailop < [email protected]> wrote: > Am 12.02.26 um 10:03 schrieb Stefano Bagnara via mailop: > > Hi all, > > I didn't read news about it, but I see bogus "550 Invalid domain" replies > to MAIL FROM from many IP/domains when sending email to libero.it since > 11/2/2026 16:00 CET (the transaction hangs some seconds in the mail from > and then returns the invalid domain error). > > I confirmed the issue also sending from a consumer gmail inbox: I got a > bounce "550 Invalid domain". > > They probably have DNS issues and incorrectly configured SMTP handling of > DNS failures. Any failures (except for explicit NXDOMAIN responses) should > IMHO lead to temporary rejections (4xx codes), not permanent rejections > such as 550. > > As we don't have much interaction with italian contacts, I did not see > that error on our mail systems. > > Cheers, > Hans-Martin > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop >
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