To check if a link or attachment is safe or not, follow these steps:

1. Suspicious email attachments and links should raise red flags – make sure to take extra caution.
2. Be wary of any email, attachment, or link that solicits for personal information such as credit card numbers, passwords, birth date, home address, etc.
3. Pay attention to email that uses a sense of urgency to get you to immediately click on the link or open the attachment.
4. Check the sender's email address and make sure that it is from an email account that you are familiar with.
5. Never click on attachments from unknown emails. Even if you know the sender, it is important to check whether the email you received was unexpected and out of the ordinary for that particular sender.