There are some basic factors which every recipient should consider while opening an email such as Email Address (From whom we received email), Date & Time, Subject of Email, Name of other recipients (in the CC, BC fields), Attachment with email message.
MANY
Yes, it can. I know I got a virus from opening junk email :(
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you can get a virus trough opening the email but you most likely going to get through the link
What are the factors to consider in comparing monitors?
factors to consider in planning a garment
Factors don't have email addresses.
I would consider both prime and composite factors - depending on what was required.
factors people consider before settling near a river
what are the factor to consider when giving in direction
what factors do you need to consider when cutting hair
By you opening it.