Hi Rob, You appear to be extrapolating; the only case I know of blackholed emails are by Outlook.com, when the sending reputation is really bad. Other ISPs usually reject the message explicitely. Hence my question about the open rate: maybe it's not globally low on Outlook.com, meaning this issue doesn't happen for all or many recipients, but only on this testing account where the user can't find the email despite the 250 reply. It's very basic support procedure, when someone is asking for help, to make sure we all have the same level of information.
What might be happening is that Microsoft considers this IP address has a very bad reputation, resulting in blackholed emails, even if there's no visible data (or at all) to back that up. We had IPs flagged as "blocked" despite not sending any traffic, so the behavior sounds similar. -- Benjamin From: Rob McEwen <r...@invaluement.com> Sent: vendredi 29 mars 2019 17:02 To: Benjamin BILLON <bbil...@splio.com>; Ricardo Signes <r...@fastmailteam.com>; mailop@mailop.org Subject: Re: [mailop] mail to Outlook accepted, then vanishing On 3/29/2019 11:42 AM, Benjamin BILLON wrote: Yeah, an extremely bad reputation can do that at Outlook.com. Are the open rates really low for emails sent from this or those IPs? Benjamin, the outlook/hotmail side of Microsoft has been out-of-control this past year, and if everyone else applied to them the same draconian standards that they sometimes apply to so many others - ALL of outlook/hotmail's sending-IPs would start getting blocked EVERYWHERE! The truth is - everyone leaks a little spam on occasions due to things like compromised accounts. But the problem here is that outlook/hotmail's responses to things like that have been very bizarre/draconian, where they have little consideration for collateral damage, and where they sometimes apply permanent blocks to short-term security issues that were ALREADY fixed. Again, imagine if the SAME standards were applied to outlook/hotmail's outbound email? Over the years, they have sent a MASSIVE amount of spam from their outbound IPs. So please don't assume that this is FastMail's issue! -- Rob McEwen, invaluement
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