「aaa@mac.comへのメールはブロックされました」とメールが届く

aaa@mac.comへのメールはブロックされました。詳しくは、下記の詳細な技術情報をご覧ください。とメールが届くようになりました。

下記の詳細な技術情報をご覧ください。

の「詳細」をクリックすると以下の英文が出てきます。

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Postmaster information for iCloud Mail

If you're a system administrator who manages mail servers that send email to iCloud Mail, learn about sending bulk email, email authentication, delivery issues, and more.

What are the requirements for sending bulk email?

Here's what's required in order to send bulk mail to iCloud Mail customers:

All requirements must be met in order to send a bulk email. If not, the email will be rejected.

• Send only to recipients who explicitly subscribed to your emails (not list purchases, list rentals, or email appends).
• Offer an unsubscribe link, so that the recipient can unsubscribe immediately.
• Add ARC headers to forwarded emails.
• Ensure compliance with RFC 5321 and RFC 5322.
• Publish reverse DNS with your domain to help identify your IP addresses.
• Use consistent sending IP addresses and domains for your bulk email, but do segment marketing and transactional email streams.
• Use a consistent From: name and address to clearly identify your brand.
• Make use of Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM) to authenticate your emails.
• The sending domain must publish their Domain-based Message Authentication, Reporting, and Conformance (DMARC) policy.
• Track the temporary and permanent SMTP errors from our mail servers and act on them accordingly.
• Have a standard policy for handling bouncing addresses.
• Periodically remove inactive subscribers from your list.
• Don't reactivate email addresses that are already on your unsubscribe or suppression list.

You can also go to the Messaging, Malware and Mobile Anti-Abuse Working Group (M3AAWG) website and check their best communication practices.

Does iCloud Mail offer an allow list for bulk senders?

We don't. We track a sender’s reputation using various mechanisms, such as IP and domain reputations, content checks, and user feedback. Then we make our filtering decisions.

Does iCloud Mail offer a feedback loop service?

We don't offer a feedback loop (FBL). We do encourage bulk email senders to manage the subscribers list, so that only engaged subscribers keep receiving your emails. Here are a few ways to maintain your subscribers list:

• Periodically suppress inactive or disengaged subscribers from your mailing list.
• Remove addresses that bounce consistently.
• Honor unsubscribe requests as soon as possible.

Email authentication

Learn more about email authentication in iCloud Mail.

What are the IP addresses that send for iCloud Mail?

All iCloud Mail domains (mac.com, me.com, and icloud.com) have a published SPF record. Check our SPF record to see the current IP ranges we use for outbound mail.

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.

Does iCloud Mail support DMARC?

If a sending domain publishes a Domain-based Message Authentication, Reporting, and Conformance (DMARC) policy, iCloud Mail honors the domain's policy. All iCloud Mail domains also have a DMARC ("p=quarantine") policy*, which indicates to a mail provider that an email from an iCloud email address that fails SPF and DKIM email authentication should go to the recipient's Junk folder.

*The policy took effect on July 2, 2018.

Delivery issues

Use the recommendations below to make sure that your recipients get your email.

Why don't our messages go to the recipient's inbox?

Please follow the best practices for sending bulk email, so that your emails won't be considered junk mail. iCloud Mail automatically detects and blocks junk mail before it reaches the inbox. We do our best to ensure that all legitimate and wanted emails get to our users, but occasionally those emails might be filtered as junk.

How can I resolve delivery issues to iCloud Mail?

When refusing SMTP transactions, our mail servers generate SMTP errors with information about why your connection or message was rejected. To find the error message, check your mail logs. Most of the errors will also include a URL that provides more information.

If you still need help

If you followed our best practices and reviewed your mail logs for more information but still can't diagnose and address delivery issues, you may contact our postmaster team by sending an email to icloudadmin@apple.com with all of the following information:

• Your company name
• Your email domain
• The IP addresses of the affected mail servers
• The SMTP errors that you're getting from iCloud mail servers
• A detailed description of the issue, including when it started

If you're not a system administrator and need help with iCloud Mail, contact Apple Support instead. 

Published Date: February 25, 2025

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Google翻訳を使っても意味が分かりませんでした。

Gmailを@macに転送しています。

ブロックされているのは、メールの送信時間から、どうも、東京電力からのメールのようですが、

なぜブロックされるのか、

プロックしているのは、Apple?googl?

対処方法は、どうするのか。

わかる方が居たら教えてください。よろしくお願いします。

＊ リンクを削除しました。Apple Inc.

＊ タイトルを変更しました。 Apple Inc.

＊ 一部編集いたしました。Apple Inc.