|The recipient email address|
|The subject line|
|The body of the email|
|Optional: headers to add to the email|
|Optional: arguments to pass to the configured mail send application in the command line|
E-Mail I'm sending through my script never arrives. What should I do?
Make sure you have error reporting turned on to see any errors.
If you have access to PHP's error log files, check those.
mail() command configured properly on your server? (If you are on shared hosting, you can not change anything here.)
If E-Mails are just disappearing, start an E-Mail account with a freemail service that has a spam folder (or use a mail account that does no spam filtering at all). This way, you can see whether the E-Mail is not getting sent out, or perhaps sent out but filtered as spam.
Did you check the "from:" address you used for possible "returned to sender" mails? You can also set up a separate bounce address for error mails.
The E-Mail I'm sending is getting filtered as spam. What should I do?
Does the sender address ("From") belong to a domain that runs on the server you send the E-Mail from? If not, change that.
Never use sender addresses like
reply-to if you need replies to arrive at a different address.
Is your server on a blacklist? This is a possibility when you're on shared hosting when neighbours behave badly. Most blacklist providers, like Spamhaus, have tools that allow you to look up your server's IP. There's also third party tools like MX Toolbox.
Some installations of PHP require setting a fifth parameter to mail() to add a sender address. See whether this might be the case for you.