All emails sent by php are spam by default. how can this problem be solved?

Source: Internet
Author: User
All mails sent by php are spam mails by default. I use phpsmtp to verify the sent mails. almost all servers are spam mails by default. How can this problem be solved? Thank you for your experience. Some mail formats or content are not formal and will be listed as spam. you can solve this problem by yourself, correct it, and try more; in addition, emails sent by php from other email servers whose server IP addresses are not sent by default as spam.
I use php smtp to verify emails sent. almost all servers use spam by default.
How can this problem be solved? Thank you!

------ Solution --------------------
I have done a little before and I have some experience. let's talk about it.
Some mail formats or content are not formal and will be listed as spam. you can solve this problem by yourself, correct it, and try more;
In addition, if your server IP address is not recognized by other email services, this may also happen.

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