Unexpected server response using sockets and STMP TLS

This is my first time I do anything with SMTP, so please have patience if I am doing something terribly wrong here :) Normally, I just use PHPMailer, but this is not an option in this case.

I am trying to send an email to people in a mailing list. I am using fsockopen and I need to use a TLS connection to do this.

This is what I do:

  • $conn = fsockopen() // my details goes in there, it connects.
  • HELO myhost.com (fwrite)
  • STARTTLS (fwrite)
  • stream_socket_enable_crypto( $conn, true, STREAM_CRYPTO_METHOD_TLS_CLIENT );
  • HELO myhost.com (fwrite)
  • AUTH LOGIN (fwrite)
  • base64_encoded USERNAME (fwrite)
  • base64_encoded PASSWORD (fwrite)
  • MAIL FROM: (fwrite)
  • RCPT TO:; (fwrite)
  • DATA (fwrite)
  • A string with all my headers (fwrite)
  • fclose($conn);

This is where something goes wrong

After using an encypted connection I can't seem to successfully read the server response. For example, when trying to read the response by using fgets($conn,1024) after my authentication it takes forever and then finally I will get a highly encrypted code not being able to look for response "235" (to make sure my authentication succeeded).

And then when I write MAIL FROM my response will look like this:

.0.0 SMTP server ready

While I think I would want something like this:

250 2.0.0

Something gets wrong, but I don't know why. I hope any of all you experts out there can help me go to the bottom with this problem :)

Thanks in advance!

SOLVED IT

In case anyone else runs into this problem.

This order works

  • $conn = fsockopen() // my details goes in there, it connects.
  • EHLO myhost.com (fwrite)
  • STARTTLS (fwrite)
  • stream_socket_enable_crypto( $conn, true, STREAM_CRYPTO_METHOD_TLS_CLIENT );
  • EHLO myhost.com (fwrite)
  • AUTH LOGIN (fwrite)
  • base64_encoded USERNAME (fwrite)
  • base64_encoded PASSWORD (fwrite)
  • MAIL FROM: (fwrite)
  • RCPT TO:; (fwrite)
  • DATA (fwrite)
  • A string with all my headers (fwrite)
  • fclose($conn);

Between every call I added the following:

stream_set_timeout($conn, 300);
set_time_limit(310);

Suddenly I got the expected replies from the server and the mail was successfully sent.

Answers


SOLVED IT

In case anyone else runs into this problem.

This order works

  • $conn = fsockopen() // my details goes in there, it connects.
  • EHLO myhost.com (fwrite)
  • STARTTLS (fwrite)
  • stream_socket_enable_crypto( $conn, true, STREAM_CRYPTO_METHOD_TLS_CLIENT );
  • EHLO myhost.com (fwrite)
  • AUTH LOGIN (fwrite)
  • base64_encoded USERNAME (fwrite)
  • base64_encoded PASSWORD (fwrite)
  • MAIL FROM: (fwrite)
  • RCPT TO:; (fwrite)
  • DATA (fwrite)
  • A string with all my headers (fwrite)
  • fclose($conn);

Between every call I added the following:

stream_set_timeout($conn, 300);
set_time_limit(310);

Suddenly I got the expected replies from the server and the mail was successfully sent.

– entiendoNull


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