HTML电子邮件联系表格的完整要求[已结束]

Question

Everywhere I've looked, from youtube, to w3schools, to the php manual (just to mention a few), none of them provided in-depth details about the requirements of successfully sending a secure email from a simple contact form...

Construction of the form and client/server validation aside, what exactly do I need to know to securely send the results via email using the php mail() function? (since it's not a heavy task for which Perl works better according to the PHP manual).

What is SMTP?, what is authentication and in what case do I need it?, what are headers?, what is x-mailer?, how exactly do I implement it all together, and what have I missed?

Answer 1

There is no such thing as secure e-mail. It generally floats across the internet in plain text.

Unless you are encrypting before sending, and the client has something to decrypt it with on their end, there is nothing you can do.

This is usually handled by storing the message on a server accessible via HTTPS, and e-mailing the person a link to it. Then, they login and view the message.