Sysadmins of the North

Technical blog, where topics include: computer, server, web, sysadmin, MySQL, database, virtualization, optimization and security

Tag: email

Release hold queue email in Postfix – postsuper

How to flush Postfix’ mail queue from the command line and delete all mail from the queue? Easy, use the Postfix postsuper command as explained in this post. 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.

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Remove Jetpack email sharing service

Recently the WordPress Jetpack email sharing service is often abused by spammers. They use the Send to Email Address for sending spam. All these kind of “Tell a Friend” scripts are abused a lot. Here is how to disable email share service in WordPress Jetpack.

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Send authenticated SMTP email over TLS from WordPress

How to configure TLS for SMTP email in WordPress. I was suprised WordPress is not able to send email using an SMTP server out-of-the-box. Not to mention using authenticated SMTP or TLS transport for security. A quick Google search showed me multiple plugins to handle this, but I wanted to create something myself. Here is how to override the wp-mail() function and send email using authenticated SMTP and StartTLS from WordPress.

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OpenPGP Best Practices

Let’s continue on the PGP (GnuPG, OpenPGP) and email security/privacy topics. Riseup put together an OpenPGP Best Practises guide.

OpenPGP.js – OpenPGP JavaScript Implementation

OpenPGP.js, the OpenPGP JavaScript Implementation deserves some attention! :-)

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“Zo versleutel je je e-mail met PGP”

Dutch tech-news site NUtech.nl wrote an extensive article on how to use PGP to encrypt your email. The article is somewhat comparable with my article “Encrypt email with PGP/GnuPG” but dives deeper into the matter. In Dutch: Zo versleutel je je e-mail met PGP.

Add (custom) headers to MailMessage class

How to add custom headers to System.Net.Mail? When sending an email using the MailMessage class (System.Net.Mail namespace) in an ASP.NET website, certain email headers like Message-ID are not always set. When a Message-ID header is missing, email might be blocked by the recipients SMTP server. Therefore it is necessary to set such headers…

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Encrypt email with PGP – GnuPG

How to encrypt email with PGP (GnuPG) to protect and secure your online privacy. The last few weeks a lot is said about government privacy infringement programs like the NSA’s program Prism and UK GCHQ’s Tempora… Did you know you can easily protect your privacy, identity and your data transmissions by encryption?

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DMARC: “Domain-based Message Authentication, Reporting & Conformance”

Just came across DMARC.org, which looks like a promising specification to fight email-based abuse. From its website:

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