How to attach a data:image/png;base64 image to a letter and send it to the mail?

Question

PHP

Hello.
The site has a constructor that generates svg images. Through js, I took this svg and converted it to base64. Now I need to send this picture to email. At first, I tried to send this picture not as an attachment, but as a link. On thunderbird, the link was displayed normally, but mail.ru cut off this link (completely removed the tag <a>). Sending with an attachment also fails, because for this, as I understand it, you need the path to the picture and the name.
Help, please, to solve this problem. I've been struggling with this issue for several days now.

Answer 1

Libraries should always be used.
In PHP, Swift Mailer is the de facto standard.
Image embedding example
swiftmailer.org/docs/messages.html#embedding-inlin...