Receive mails

How to receive a mail?
I am not the recipient, why did I receive the email?
Why cannot I receive external site mail?
The recipient did not receive the email, why did the sender never receive the bounce?
Will my mail system automatically delete incoming mail?
Why cannot I receive a email from my friend?
The mailbox space is limited. I hope to make room and hope to keep the original mail. What should I do?
How do I delete unwanted mails in my mailbox?
SMTP/POP3 settings are correct, but mail cannot be sent or received
How do I reject a emails?
What are the benefits of connected account? How to set up?
How to arrange the mail order?
What do the status flags of the mail mean?
How do I tag my mail status?
Will the server automatically blank the "Deleted" folder?
I have a new mail in my inbox, but how can I not find it?
How to create a new folder?
How to modify or delete a self-built folder?
What is the use of mail top?
How to set email to the top?
Which folder can mails be set-top in?
How do I bulk add senders and recipients to my contacts when I read a mail?
What do I want to do with multiple category tags for my mail?
What do I want to do to see mails related to the sender when I read the mail?
How to reply with an attachment?