PHP邮件功能无法完成电子邮件的发送

For those who do not want to use external mailers and want to mail() on a dedicated Linux server.

The way, how PHP mails, is described in php.ini in section [mail function].

Parameter sendmail-path describes how sendmail is called. The default value is sendmail -t -i, so if you get a working sendmail -t -i < message.txt in the Linux console - you will be done. You could also add mail.log to debug and be sure mail() is really called.

Different MTAs can implement sendmail. They just make a symbolic link to their binaries on that name. For example, in Debian the default is Postfix. Configure your MTA to send mail and test it from the console with sendmail -v -t -i < message.txt. File message.txt should contain all headers of a message and a body, destination address for the envelope will be taken from the To: header. Example:

From: myapp@example.com
To: mymail@example.com
Subject: Test mail via sendmail.

Text body.

I prefer to use ssmtp as MTA because it is simple and does not require running a daemon with opened ports. ssmtp fits only for sending mail from localhost. It also can send authenticated email via your account on a public mail service. Install ssmtp and edit configuration file /etc/ssmtp/ssmtp.conf. To be able also to receive local system mail to Unix accounts (alerts to root from cron jobs, for example) configure /etc/ssmtp/revaliases file.

Here is my configuration for my account on Yandex mail:

root=mymail@example.com
mailhub=smtp.yandex.ru:465
FromLineOverride=YES
UseTLS=YES
AuthUser=abcde@yandex.ru
AuthPass=password

Make sure you have Sendmail installed in your server.

If you have checked your code and verified that there is nothing wrong there, go to /var/mail and check whether that folder is empty.

If it is empty, you will need to do a:

sudo apt-get install sendmail

if you are on an Ubuntu server.

如果仅使用该mail()功能，则需要完成配置文件。

您需要打开邮件扩展，并设置SMTP smtp_port等等，最重要的是您的用户名和密码。否则，将无法发送邮件。另外，您可以使用PHPMail该类进行发送。

1. 始终尝试在邮件功能中发送标题。
2. 如果要通过本地主机发送邮件，请执行SMTP设置以发送邮件。
3. 如果要通过服务器发送邮件，请检查服务器上是否启用了电子邮件发送功能。