Send email with PowerShell
Easily send your DevOps reporting by email with this PowerShell function, because the Send-MailMessage cmdlet is obsolete. Of course you'll be using StartTLS and authenticated SMTP as additional security.
Release hold queue email in Postfix – postsuper
The postsuper command controls different types of queues in the Postfix mail system, like the deferred or hold queue. This post shows you some Postfix queue operations to maintain your mail servers.
Send authenticated SMTP email over TLS from WordPress
Learn how to override wp-mail() and send secure email using authenticated SMTP and StartTLS from WordPress.
Add (custom) headers to MailMessage class
The System.Net.Mail Namespace leaves out the required Message-ID header in email. Here is how you can add this important header to your email, to make sure email arrives.