Title: S/MIME Email Signing Author: Liups233 Published: 28 de agosto de 2025 Last modified: 28 de agosto de 2025 --- Buscar plugins Este plugin **no se ha probado con las últimas 3 versiones mayores de WordPress**. Puede que ya no tenga soporte ni lo mantenga nadie, o puede que tenga problemas de compatibilidad cuando se usa con las versiones más recientes de WordPress. ![](https://ps.w.org/smime-email-signing/assets/icon-256x256.jpg?rev=3352039) # S/MIME Email Signing Por [Liups233](https://profiles.wordpress.org/liups12138/) [Descargar](https://downloads.wordpress.org/plugin/smime-email-signing.1.0.zip) * [Detalles](https://es.wordpress.org/plugins/smime-email-signing/#description) * [Valoraciones](https://es.wordpress.org/plugins/smime-email-signing/#reviews) * [Instalación](https://es.wordpress.org/plugins/smime-email-signing/#installation) * [Desarrollo](https://es.wordpress.org/plugins/smime-email-signing/#developers) [Soporte](https://wordpress.org/support/plugin/smime-email-signing/) ## Descripción This plugin is for signing all outbound emails with an S/MIME certificate. It uses phpmailer to automatically sign emails. Here are the prerequisites to use this plugin: * This plugin is for single-user WordPress site, such as a personal blog. I don’t know what will happen if you put it in a multi-user site. * PHP 8.3 and above are recommended. Make sure your PHP has openssl extension, which is usually installed by default. * You should use another plugin, such as FluentSMTP, to send emails through an external SMTP server. ## Capturas [⌊Plugin settings⌉⌊Plugin settings⌉[ Plugin settings [⌊How S/MIME signing looks like in Gmail⌉⌊How S/MIME signing looks like in Gmail⌉[ How S/MIME signing looks like in Gmail ## Instalación #### Get a S/MIME certificate You can go to Actalis to apply for a free S/MIME certificate for one year. After applying, you can download a p12 certificate file, which contains public key, private key, and certificate chain. The password to the p12 file will be sent to your email. #### Split the p12 file In case the p12 file is named «smime.p12», do the following commmands to split it into seperated keys. * Export the private key: `openssl pkcs12 -in smime.p12 -nocerts -out smime.key` - You will be asked for the Import password, which is the password to the p12 file. - Then, you need to enter a password to protect the exported private key. This password is what we will fill in the plugin setting. - Enter twice to confirm it. * Export the public key: `openssl pkcs12 -in smime.p12 -clcerts -nokeys -out smime. crt` - You will be asked for the Import password, which is the password to the p12 file. * Export the certificate chain: `openssl pkcs12 -in smime.p12 -cacerts -nokeys - out certchain.pem` - You will be asked for the Import password, which is the password to the p12 file. #### Set correct permission After uploading the seperated key files to your server, you have to set correct permission to each file. * Private key: `chmod 640 smime.key` * Public key: `chmod 644 smime.crt` * Certificate chain: `chmod 644 certchain.pem` #### Plugin settings Install and activate the plugin, the setting page will appear on the left, with a sheild icon. What you need to do is filling the path and password fields, click Save, and everything is OK. You can use the Email Send Test function in your SMTP plugin to test it. The options will be deleted automatically after uninstalling the plugin. ## Reseñas ![](https://secure.gravatar.com/avatar/f5d1ed3aaf47c3fcb19cf8edf2cd67c26e01adfe8d4ff4867ab85af71234a875? s=60&d=retro&r=g) ### 󠀁[Works Seamlessly](https://wordpress.org/support/topic/works-seamlessly-65/)󠁿 [Mitchell Couch](https://profiles.wordpress.org/mitchellcouch/) 30 de julio de 2026 1 respuesta It's an excellent plugin for a single operator like myself, sending signed mail from my website. It works too with my SMTP plugin, FluentSMTP. Suggestion: I would like to be able to send encrypted email from my website to my admin address using the S/MIME protocol. This way, in my case, messages sent to me by users through various forms on my website will be end-to-end encrypted. [ Leer la 1 reseña ](https://wordpress.org/support/plugin/smime-email-signing/reviews/) ## Colaboradores y desarrolladores «S/MIME Email Signing» es un software de código abierto. Las siguientes personas han colaborado con este plugin. Colaboradores * [ Liups233 ](https://profiles.wordpress.org/liups12138/) [Traduce «S/MIME Email Signing» a tu idioma.](https://translate.wordpress.org/projects/wp-plugins/smime-email-signing) ### ¿Interesado en el desarrollo? [Revisa el código](https://plugins.trac.wordpress.org/browser/smime-email-signing/), echa un vistazo al [repositorio SVN](https://plugins.svn.wordpress.org/smime-email-signing/) o suscríbete al [registro de desarrollo](https://plugins.trac.wordpress.org/log/smime-email-signing/) por [RSS](https://plugins.trac.wordpress.org/log/smime-email-signing/?limit=100&mode=stop_on_copy&format=rss). ## Registro de cambios #### 1.0 * Initial release. ## Meta * Versión **1.0** * Última actualización **hace 1 año** * Instalaciones activas **Menos de 10** * Versión de WordPress ** 6.7 o superior ** * Probado hasta **6.8.11** * Versión de PHP ** 7.2 o superior ** * Idioma * [English (US)](https://wordpress.org/plugins/smime-email-signing/) * Etiquetas: * [email](https://es.wordpress.org/plugins/tags/email/)[smime](https://es.wordpress.org/plugins/tags/smime/) * [Vista avanzada](https://es.wordpress.org/plugins/smime-email-signing/advanced/) ## Valoraciones 5 de 5 estrellas. * [ 1 valoración de 5 estrellas ](https://wordpress.org/support/plugin/smime-email-signing/reviews/?filter=5) * [ 0 valoraciones de 4 estrellas ](https://wordpress.org/support/plugin/smime-email-signing/reviews/?filter=4) * [ 0 valoraciones de 3 estrellas ](https://wordpress.org/support/plugin/smime-email-signing/reviews/?filter=3) * [ 0 valoraciones de 2 estrellas ](https://wordpress.org/support/plugin/smime-email-signing/reviews/?filter=2) * [ 0 valoraciones de 1 estrellas ](https://wordpress.org/support/plugin/smime-email-signing/reviews/?filter=1) [Tu valoración](https://wordpress.org/support/plugin/smime-email-signing/reviews/#new-post) [Ver todas las reseñas](https://wordpress.org/support/plugin/smime-email-signing/reviews/) ## Colaboradores * [ Liups233 ](https://profiles.wordpress.org/liups12138/) ## Soporte ¿Tienes algo que decir? ¿Necesitas ayuda? [Ver el foro de soporte](https://wordpress.org/support/plugin/smime-email-signing/) ## Donar ¿Te gustaría apoyar el progreso de este plugin? [ Dona a este plugin ](https://paypal.me/liups1213?country.x=C2&locale.x=zh_XC)