配信不能メール -- (未配信): 554 5.4.7 >>> [内部] 配信されずに最大時間を超えました

Undeliverable mail -- (Undelivered): 554 5.4.7 >>> [internal] exceeded max time without delivery

Scenario 1: Email from Salesforce via Office 365 (no relay as this is not a list email): DKIM -- pass (signature was verified)

Scenario 2: Email from Salesforce via list email (email relay) through Office 365: DKIM = none (message not signed)

Original undeliverable message is:  (Undelivered): 554 5.4.7 [internal] 
>>> exceeded max time without delivery

I was able to figure this out but it was so long ago, I’m not really for sure. I believe it was setting the CNAME dns for Salesforce.

I see in my notes:

CNAME sfdc2023._domainkey

sfdc2023.d05ypv.custdkim.saleforce.com
CNAME mail

sfdc2023.d05ypv.custdkim.saleforce.com
CNAME sfdc2023b._domainkey

sfdc2023.d05ypv.custdkim.saleforce.com
I believe it was something with the DNS, when it was first set up it was 2019.sfdc._domainkey. We switched providers and had to reset everything in 2023.

私はこれを理解することができましたが、かなり前のことなので、実際には確信がありません。Salesforce の CNAME DNS を設定していたと思います。

私のメモを見ると次のようになります。

CNAME sfdc2023._domainkey

sfdc2023.d05ypv.custdkim.saleforce.com
CNAMEメール

sfdc2023.d05ypv.custdkim.saleforce.com
CNAME sfdc2023b._domainkey

sfdc2023.d05ypv.custdkim.saleforce.com
DNS に関する問題だったと思います。最初に設定したときは 2019.sfdc._domainkey でした。プロバイダーを変更したため、2023 年にすべてをリセットする必要がありました。

554 5.7.1 [HM08] Message rejected due to local policy. icloud.com email

Have you configured SPF and DKIM?

Does iCloud Mail use email authentication?

iCloud Mail authenticates all inbound emails using SPF and DKIM. We also publish SPF records for our domains and sign all of our outbound emails with DKIM.

https://support.apple.com/en-us/102322