Q: How to use contact and aggregation?

zhaozj2021-02-12  157

Blog rookie asked a few simple questions:

1 . When using the contact, I always prompt "I fail to send mail, may be a mail server problem." I use a valid email address, how can this?

2. I clicked aggregate, there is a page like XML file, what is the role?

3. What is the function of TRACKBACK?

Thank you!

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