As you may have heard. Apache email and Microsoft's spam filtering systems don't mix:
There have been ongoing problems with Microsoft domains partly because many of their users report our legitimate email as spam. The Infrastructure team have been trying to get the bans removed, but with no success. At present mails from one of the two ASF outbound servers are being rejected; i.e. on average 50% of mails will not be delivered. The following Microsoft domains are all affected (as of August 2021): * hotmail.com * live.com * outlook.com I have now tried to setup specific mail rules, specific "safe senders" for apache.org, and nothing seems to prevent many apache emails a day from going into the Microsoft outlook Junk email folder. At this point I have requested Apache INFRA to make this problem better known. The only page I can find discussing it requires an Apache sign-on. The only workaround is not to use a Microsoft email system (e.g., my company email is Outlook 365) for Apache emails. -mike beckerle Apache Daffodil PMC Mike Beckerle | Principal Engineer [cid:8aabe1f0-0b1c-49d1-9bc8-3ad480e643a6] mbecke...@owlcyberdefense.com<mailto:bhum...@owlcyberdefense.com> P +1-781-330-0412