Is there a SMTP mail transfer library in PHP
To send email using an SMTP Server in PHP, we are using the PHPMailer Library. So, we need to download and include the PHPMailer library in mail sending script. Click on the link below to download the PHP mailer class from GitHub and include it in your script.
After re-reading this, I see there's more to it than just a library. You are asking to send direct to the remote MX.
Why reinvent the wheel? Set up an instance of postfix on the server, which only listens to connections from the web server... and let an MTA do what it does best. Hand off the messages from php to a real mail server and move on.
In the case of ISP's that block outbound port 25 and force the use of a smarthost, this also allows you to restrict the rate of messages sent to the smarthost.
Lastly, sending straight to the end MX from your php script is a bad idea, because if you send to me, I'll never get it. I and many other sites use "greylisting" to reduce spam, which denies all initial requests with a 450 temporary error. Real MTA's will try again, but unless you implemented a delay queue and try again, your message will never go through.\
I want to write an email transfer service and need a MTU replacement of sendmail/postfix.
I'm not looking how to deliver to a transmitting SMTP server (like a postfix listing on a SMTP port). I also don't need the receiving part of the server, bounces etc. would go to a different existing postfix.
All of it in pure PHP. SMTP is a pretty easy protocol but this would require access to the MX DNS record and other lot of details that need to be taken care of.
Why do i need this? Because most shared internet providers have insane low limits for sending out emails like 500 per day. Thats almost nothing if you want to setup even the lowest traffic email list.
EDIT: Please Note: The code needs to connect to the receivers SMTP server and deliver the message with an adapted header set (removed BCC list, added Path route). If you see a SMTP class less then 5000 lines or requires you to configure a SMTP hostip and port then this is not the stuff i'm looking for.
It needs to do all the stuff sendmail is doing just as a PHP library.
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