Css is written in the content sent using phpmailer, backgroundurl (xxx) is used in css, and the url () is null.

Css is written in the content sent by phpmailer, backgroundurl (xxx) is used in css, and css is written in the content sent by phpmailer, the background url (xxx) is used in css, and the url () is null. what is the problem? Who has had the same experience?
I don't know where to filter.

Reply to discussion (solution)

To send an email, you need to write the specific address of the url, which can be accessed through the Internet.

To send an email, you need to write the specific url. I write the specific url that can be accessed through the Internet. I mean it's all blank. It seems to be a filtering process, but I don't know where to process it.

To send an email, you need to write the specific url. I write the specific url that can be accessed through the Internet. I mean it's all blank. It seems to be a filtering process, but I don't know where to process it.
I have never encountered this problem. my previous emails contain background and the same url, but I have never encountered this situation.
Which of your other styles may affect the block
I have encountered such a problem, that is, the mail is sent out, but the style is gone, because some styles in it are affected. you can optimize your style.

To send an email, you need to write the specific url. I write the specific url that can be accessed through the Internet. I mean it's all blank. It seems to be a filtering process, but I don't know where to process it.
I have never encountered this problem. my previous emails contain background and the same url, but I have never encountered this situation.
Which of your other styles may affect the block
I have encountered such a problem, that is, the mail is sent out, but the style is gone, because some styles in it are affected, you can optimize the problem of your style mailbox, and change the mailbox account to OK.