メールの送受信数に関する制限

To help prevent spam and keep accounts safe, Gmail limits the number of emails you can send or get per day, and the number of people you can add as recipients.

How to fix the problem

Look at the reasons below to learn how to prevent seeing these messages in the future.

注: 職場や学校などの組織で Gmail アカウントを使用している場合は、職場や学校での Gmail メールの送信に関する制限事項をご確認ください

"You have reached a limit for sending mail"

1 通のメールを合計 500 件を超える宛先に送信したり、1 日に 500 通を超えるメールを送信した場合は、このメッセージが表示されます。

このエラーが表示された場合は、1~24 時間以内に再びメールを送信できるようになります。

今後このエラーを防ぐには、メールの宛先をすべて含む Google グループを作成し、作成したグループのメールアドレス宛にメールを送信します。

"Messages you sent couldn't be delivered"

You might see this error if a large number of emails you send:

  • Can't be delivered because the recipient's email address is invalid
  • Bounce from the recipient's email server

You may be able to send emails again after 24 hours.

To prevent this from happening in the future, check your recipient's' email addresses before sending to make sure they're up to date.

A contact is getting too much mail

If someone you’re sending mail to is getting too many emails too fast, you might see this message:

"The user you are trying to contact is receiving mail at a rate that prevents additional messages from being delivered."

You’ll need to contact the person another way.

Learn about accounts that limit how many emails a person can get.

One of your recipients is a Google+ contact

You may see this message if you're replying to or sending an email whose recipients include a Google+ connection. This error isn't caused by breaking Gmail's sending limits, but is an issue that's being fixed by Gmail.

To prevent this from happening in the future, remove that recipient from the message.

Tips for sending bulk emails

If you're sending many emails at a time, or emails to large groups, review our bulk senders guidelines.

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