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1 vote

SPF spf.protection.outlook.com is invalid for messages within tenant

Your speculation about Microsoft's SPF/DKIM may be partially correct. Since the email is located in the same rental households, Microsoft may trust these emails by default, and will not apply the same ...
Billkirt's user avatar
4 votes
Accepted

SPF spf.protection.outlook.com is invalid for messages within tenant

Usually, these Authentication checks are performed at the Edge of the Organization's network, thus it would make sense for these headers to be absent in internal email flow. Other headers do offer ...
Reinto's user avatar
  • 1,023
0 votes

Postfix - Recipient Address Rejected on Incoming Mail Only

You need to configure this also smtpd_tls_security_level = may smtpd_tls_mandatory_ciphers = high smtpd_tls_mandatory_exclude_ciphers = aNULL, eNULL, MD5,EXPORT,DES,RC4 ...
Turdie's user avatar
  • 2,524
2 votes
Accepted

Is it a good idea to add `calendar-server.bounces.google.com` to my SPF record?

No, messages with this sender are not authorized by you beyond what their signature says, and you should avoid any strategy of signalling to other servers that they were. Google Calendar invites have ...
anx's user avatar
  • 9,635
0 votes

record DKIM on IONOS makes sense?

IONOS does now finally support DKIM. They added it recently, maybe September 2023 or maybe more recent. I found out earlier this week when my emails randomly started passing DKIM one day -- IONOS had ...
Dtor's user avatar
  • 101

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