Mailcheck | Mailcheck is a tool that allows users and administrators | Monitoring library

The 404 error shows that the file is either missing or you are redirecting to the wrong directory. What does the $_POST["submit"] return? Also try to remove the headers completely and see if it still returns something. Try a var_dump() or echo after removing the headers.

I have been using xampp myself and mainly 404 has to do with the wrong filepath when I give a wrong input.

The ../ means a directory above the current directory.

I believe it is because you are trying to stringify your post data. This is not neccessary with axios and the server is probably getting the email in a different format than you are expecting, so it is not finding a match.

Try this:

Your code does not check to see if a form has been submitted, so it will send email every time you hit the page. Wrap it in an if:

Couple of nits to pick in your code aside from the obvious typo of CURLOPT_POST. You use filter_var but carry on if the filter fails; you should check for a false value. You should not be using urldecode on the URL, the whole idea of http_build_query is that it does the URL encoding for you. This one's a personal preference but I find curl_setopt_array much easier to work with. And, you should be checking if your result is valid JSON and use proper headers when sending the response back to jQuery.

Instead of adding those two strings, you're meaning to put them in an array. In Python, that's either

Instead of using a regular function which will be lost this scope whereas arrow function keeps track of this. Read more about the difference here https://stackoverflow.com/a/34361380/5836034

do something like this

use classpath (-cp)

javac -cp %YOUR_JAR_LOCATION% mail.java

Example :

javac -cp ".:./jars/mail.jar" helloworld.java
java -cp ".:./jars/mail.jar" helloworld

For Windows, ":" should be replaced with ";" and make sure your jar file path is correct.

What you are looking for is a negative lookaround.

(I'm gonna simplify the first part of the regex so it's easily understandable)

You could

• put the recipients into a List

• as outer loop, iterate while the list is not empty. To avoid an endless loop, you may consider to limit the number of iterations.

• connect to the SMPT server

• as inner loop, send the messages. When a mail could be sent, remove the recipient from the list. If a transient error occured, exit the inner loop

Did you consider using an existing SMTP client implementation like https://github.com/jstedfast/MailKit or at least System.Net.SmtpClient?