PHP + Postfix MTA：请勿使用TLS

Question

I've installed Postfix and PHP on one of my servers (Debian)

TLS in Postfix' configuration is enabled:

• smtp_use_tls = yes
• smtp_tls_security_level = may

Regularly I need to send out a newsletter Email to ~1,000 addresses.
These mails are "send" via PHP's mail() function. PHP hands these Emails over to Postfix for delivery.

Is there a way to disable TLS when "sending" mails from PHP?
Can this be done by somehow modifying Postfix' master.cf ?

It should work like this:

• Incoming Emails -> Use TLS
• Outgoing Emails -> Use TLS
• Outgoing Emails from PHP -> Do not use TLS

In other words:
Can Postfix be configured to deliver mails without TLS if they are received via a different port?
Like this:

• Outgoing Emails when received from Port 25 -> Use TLS
• Outgoing Emails when received from Port xy -> Do not use TLS

Answer 1

除非您设置单独的Postfix实例，否则这是不可能的。

Answer 2

Yes it can.

You may need to use an actual SMTP client via PHP (eg SwiftMailer ), but you can host smtpd with separate options on a separate port, eg

192.168.22.2:10587 inet  n       -       n       -       10      smtpd
  -o syslog_name=submission/mass-mail
  -o smtpd_tls_security_level=none
  -o smtpd_relay_restrictions=
  -o smtpd_recipient_restrictions=permit_mynetworks,reject
  -o mynetworks=127.0.0.0/8,192.168.22.2/24