New Built-in Mailer Feature

The old [TCP] built-in mailer is now deprecated. Use the P=[IPC] (interprocessor communications) built-in mailer instead. The [IPC] built-in mailer now allows delivery to a UNIX domain socket on systems that support it. You can use this mailer with LMTP delivery agents that listen on a named socket. An example mailer might look like the following.

Mexecmail, P=[IPC], F=lsDFMmnqSXzA5@/:|, E=\r\n, 
S=10, R=20/40, T=DNS/RFC822/X-Unix, A=FILE /var/run/lmtpd

The first mailer argument in the [IPC] mailer is now checked for a legitimate value. The following table provides possible values for the first mailer argument.