In the circumstances you described it probably means your message was deemed spammy for whatever reason. If that is the typical message content for the sender on your end, then yes they should probably treat it as a hard bounce.
It is difficult to say more without some context, or in a public forum. --Erwin On Fri, Sep 20, 2019 at 3:00 AM Andy Onofrei via mailop <mailop@mailop.org> wrote: > HI all, > > > > Does anyone have a contact at Barracuda email security team ? Or if anyone > has some insights on the potential reasons for the following bounce > > 550 permanent failure for one or more recipients (<removed>@domain.com: > blocked) > > > > Some insights .. before this bounce the sender was able to send > successfully other 4 emails to the same recipient in the last week. > > I was under the assumption that in this case the recipient has blocked all > emails from the sender and I should treat it as a hard bounce. > > > > Anyone has any insights? > > > > > > *Andrei Onofrei* > > Dynamics 365 Email Deliverability Engineer > > andrei.onof...@microsoft.com | +420 601 358 583 > > BBC Delta Building, Vyskočilova 1561/4a, 140 00 Prague, The Czech Republic > > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >
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