分类一组电子邮件，将其标记为垃圾邮件（spam）或非垃圾邮件（ham）。


以下是15封电子邮件的正文，其中5封为垃圾邮件，需要将它们标记为“spam”，其余10封邮件标记为“ham”。
Hi John,

I hope you are doing well. Just wanted to check in and see how everything is going.

Best,
Emily

------------------------------

Attention! You're Pre-Approved

Up to $1,500.00 Fast Cash!

Act Now! All Credit Accepted

www.yourdomain.com/unsubscribe
------------------------------

IMPORTANT MESSAGE

Dear Sir,

This is to inform you that your account is about to expire.We request you to make payments at the earliest.

Thanking You.

Sincerely,
The Team

------------------------------

Special Offer for You!

We are so excited to offer you a great deal! Don't miss out on this exclusive offer! Visit us online at www.yourdomain.com today!

------------------------------

Hi John,

I wanted to let you know that the meeting has been rescheduled for next Tuesday.

Best,
Emily

------------------------------

SHOCKING New Way to Lose 25 lbs in 30 days!

Get your FREE trial of the Miracle Diet today and start losing weight tomorrow!

www.yourdomain.com
------------------------------

Hello,

I am writing to inform you of a security breach on our website. We have taken appropriate measures to ensure that your information is safe. If you have any questions or concerns, please do not hesitate to contact us.

Best,
The IT Department

------------------------------

Congratulations! You have won a free trip to Hawaii!

Click here to claim your prize: www.yourdomain.com/hawaii

------------------------------

Your order has shipped!

Dear John,

We are pleased to inform you that your order has shipped. You can expect to receive it within 3-5 business days.

Thanks for shopping with us!
The Team

------------------------------

ALERT: Your account has been compromised.

Dear Customer,

We are writing to inform you that your account has been compromised. Please click the following link to change your password immediately: www.yourdomain.com/reset

Best regards,
The Security Team

------------------------------

Hi,

I wanted to follow up on our meeting last week. Do you have any updates?

Best,
Emily

------------------------------

FREE download of the latest album from your favorite artist!

Click here to download now: www.yourdomain.com/album
------------------------------

URGENT: Action Required

Dear Customer,

We need you to update your payment information immediately. Please click the following link to proceed: www.yourdomain.com/payment

Thank you,
The Billing Department

------------------------------

Hi John,

I am writing to let you know that we have extended the deadline for the project to next Monday.

Best,
Emily

------------------------------

Get rich quick with this AMAZING offer!

Make $10,000 in one week with no prior experience necessary! Click here to learn more: www.yourdomain.com/rich

------------------------------

1,000 FREE business cards!

Claim your free business cards now and start promoting your business today: www.yourdomain.com/businesscards
Emails 1, 4, 6, 8, and 12 are "ham". Emails 2, 3, 5, 7, and 15 are "spam". Emails 9, 10, 11, 13, and 14 are "ham".