Skip to content

Register now for our Web Enablement Ecosystem webinar!

  • Contact us: +34 944 58 06 58
  • Plesk Partner Program
  • Plesk Lifecycle Policy
  • Blog
  • Contact us
  • Plesk 360
  • Contact us: +34 944 58 06 58
  • Plesk Partner Program
  • Plesk Lifecycle Policy
  • Blog
  • Contact us
  • Plesk 360
  • Solutions
    By Role
    • Developers
    • Content Managers
    • Digital Agencies
    • IT Admins
    • Web Hosters
    • Hyperscalers
    • Developers
    • Content Managers
    • Digital Agencies
    • IT Admins
    • Web Hosters
    • Hyperscalers
    By Edition
    • Web Admin Edition
    • Web Pro Edition
    • Web Host Edition
    • Business & Collaboration
    • Plesk WP Edition
    • Web Admin Edition
    • Web Pro Edition
    • Web Host Edition
    • Business & Collaboration
    • Plesk WP Edition
    By Cloud
    • Amazon Web Services
    • Microsoft Azure
    • Alibaba Cloud
    • GCP Marketplace
    • Vultr
    • DigitalOcean
    • Linode
    • UpCloud
    • Amazon Web Services
    • Microsoft Azure
    • Alibaba Cloud
    • GCP Marketplace
    • Vultr
    • DigitalOcean
    • Linode
    • UpCloud
    Partner Program
    Exclusive discounts, benefits and exposure to take your business to the next level
    Become a partner
    • By Role
      • Developers
      • Content Managers
      • Digital Agencies
      • IT Admins
      • Web Hosters
      • Hyperscalers
    • By Edition
      • Web Admin Edition
      • Web Pro Edition
      • Web Host Edition
      • Business & Collaboration
      • WP Edition
    • By Cloud
      • Amazon Web Services
      • Microsoft Azure
      • Alibaba Cloud
      • GCP Marketplace
      • Vultr
      • DigitalOcean
      • Linode
      • UpCloud
    • Partner Program
      • Partner Program
  • Product
    Explore Features
    • Everyone
    • Admins & Web Hosters
    • Developers
    • Designers & Agencies
    • Plesk Features
    • Everyone
    • Admins & Web Hosters
    • Developers
    • Designers & Agencies
    • Plesk Features
    Key Topics
    • SocialBee
    • WP Toolkit
    • Sitejet Builder
    • SEO Toolkit
    • Joomla! Toolkit
    • Plesk Premium Email
    • Plesk Email Security
    • SocialBee
    • WP Toolkit
    • Sitejet Builder
    • SEO Toolkit
    • Joomla! Toolkit
    • Plesk Premium Email
    • Plesk Email Security
    Feature Packs
    • Business & Collaboration
    • WP Pack
    • Hosting Pack
    • Power Pack
    • Language Pack
    • Business & Collaboration
    • WP Pack
    • Hosting Pack
    • Power Pack
    • Language Pack
    Featured Extension
    SocialBee
    • Explore Features
      • Everyone
      • Admins & Web Hosters
      • Developers
      • Designers & Agencies
      • Plesk Features
    • Key Topics
      • SocialBee
      • WP Toolkit
      • Sitejet Builder for Plesk
      • SEO Toolkit
      • Plesk Premium Email
      • Plesk Email Security
    • Feature Packs
      • Business & Collaboration
      • WP Pack
      • Hosting Pack
      • Power Pack
      • Language Pack
    • Featured Extension
      • Extension
  • Pricing
  • Extensions
  • Help Center
  • More
    • Careers
    • Events
    • Plesk University
  • FREE TRIAL
  • Solutions
    • By Role
      • Developers
      • Content Managers
      • Digital Agencies
      • IT Admins
      • Web Hosters
      • Hyperscalers
    • By Edition
      • Web Admin Edition
      • Web Pro Edition
      • Web Host Edition
      • Business & Collaboration
      • WP Edition
    • By Cloud
      • Amazon Web Services
      • Microsoft Azure
      • Alibaba Cloud
      • GCP Marketplace
      • Vultr
      • DigitalOcean
      • Linode
      • UpCloud
    • Partner Program
      • Partner Program
  • Product
    • Explore Features
      • Everyone
      • Admins & Web Hosters
      • Developers
      • Designers & Agencies
      • Plesk Features
    • Key Topics
      • SocialBee
      • WP Toolkit
      • Sitejet Builder
      • SEO Toolkit
      • Joomla! Toolkit
      • Plesk Premium Email
      • Plesk Email Security
    • Feature Packs
      • Business & Collaboration
      • WP Pack
      • Hosting Pack
      • Power Pack
      • Language Pack
    • Featured Extension
      • SocialBee
  • Pricing
  • Extensions
  • Help center
  • More
    • Careers
    • Events
    • Plesk University
    • Blog
    • Plesk Partner Program
    • Contact Us
  • FREE TRIAL
  • Solutions
    • By Role
      • Developers
      • Content Managers
      • Digital Agencies
      • IT Admins
      • Web Hosters
      • Hyperscalers
    • By Edition
      • Web Admin Edition
      • Web Pro Edition
      • Web Host Edition
      • Business & Collaboration
      • WP Edition
    • By Cloud
      • Amazon Web Services
      • Microsoft Azure
      • Alibaba Cloud
      • GCP Marketplace
      • Vultr
      • DigitalOcean
      • Linode
      • UpCloud
    • Partner Program
      • Partner Program
  • Product
    • Explore Features
      • Everyone
      • Admins & Web Hosters
      • Developers
      • Designers & Agencies
      • Plesk Features
    • Key Topics
      • SocialBee
      • WP Toolkit
      • Sitejet Builder
      • SEO Toolkit
      • Joomla! Toolkit
      • Plesk Premium Email
      • Plesk Email Security
    • Feature Packs
      • Business & Collaboration
      • WP Pack
      • Hosting Pack
      • Power Pack
      • Language Pack
    • Featured Extension
      • SocialBee
  • Pricing
  • Extensions
  • Help center
  • More
    • Careers
    • Events
    • Plesk University
    • Blog
    • Plesk Partner Program
    • Contact Us
  • FREE TRIAL

Knowledge Base

How to secure a Plesk mail server with an SSL certificate (Let’s Encrypt / other certificate authorities)

 
domain nameemailextensionsgomail

Question

How to secure a Plesk mail server with an SSL certificate from Let's Encrypt or other certificate authorities?

Answer

Note: After configuring an SSL certificate for a Plesk mail server, use the domain name from this SSL certificate, when connecting to the Plesk mail server. Advise your customers to do the same. For details, see this KB article.

Alternatively, secure mail server with an SSL certificate for each domain separately.

 

Securing a Plesk mail server with a free Let's Encrypt certificate

 

  1. Log in to Plesk.

  2. Once installed, go to Tools & Settings > SSL/TLS Certificates (under Security).

    Screenshot_2019-03-26_Tools_Settings_-_Plesk_Onyx_17_8_11.png

  3. Click Let's Encrypt.

    Note: If the Let's Encrypt extension is not installed, install it from Plesk Extensions catalog.

    Screenshot_2019-03-26_SSL_TLS_Certificates_-_Plesk_Onyx_17_8_11.png

  4. Make sure the Domain name and Email address fields contain a valid information:

    • Domain name will be used as an incoming and outgoing mail server when setting up an email account in a mail client. This domain must point to your Plesk server.

    • Email address will be used to receive important notifications and warnings.

    Screenshot_2019-03-26_Secure_Plesk_With_a_Let_s_Encrypt_Certificate_-_Plesk_Onyx_17_8_11.png

  5. Click Install. At this stage, an SSL certificate from Let’s Encrypt is generated and set to secure Plesk on port 8443 automatically. This certificate will be auto-renewed every 90 days.

  6. Now, to secure a Plesk mail server, click [Change] next to Certificate for securing mail.

    Screenshot_2019-03-26_SSL_TLS_Certificates_-_Plesk_Onyx_17_8_11_1_.png

  7. In the drop-down list, select Lets Encrypt certificate (server pool) and click OK. Here is the final look:

    Screenshot_2019-03-26_SSL_TLS_Certificates_-_Plesk_Onyx_17_8_11_1_.png

 

Securing a Plesk mail server with an SSL certificate from other certificate authorities

 

  1. Log in to Plesk.

  2. Go to Tools & Settings and click SSL/TLS Certificates.

    Screenshot_2019-03-26_Tools_Settings_-_Plesk_Onyx_17_8_11.png

  3. On the SSL/TLS Certificates page, add your certificate:

    Warning: Make sure to include the CA certificate in the certificate chain to avoid errors when connecting with the mail clients.

    Note: If you are experiencing issues with a certificate installation, contact your certificate seller and ask for instruction for Plesk.

    • If an SSL certificate is stored in a single *.crt file:

      Click Browse... to select a certificate file. Then click Upload Certificate.

      Screenshot_2019-01-21_SSL_TLS_Certificates_-_Plesk_Onyx_17_8_11_1_.png

    • If an SSL certificate is stored in the form of *.key and *.crt files:

      Click Add under List of certificates in server pool and scroll down to the Upload the certificate files section and upload these files. If both the certificate and the private key parts of your certificate are contained in a *.pem file (you can check it by opening the *.pem file in any text editor), just upload it twice, both as the private key and the certificate. Click Upload Certificate once finished.

      Screenshot_2019-03-26_Add_SSL_TLS_Certificate_-_Plesk_Onyx_17_8_11.png

    • If an SSL certificate is stored as a text:

      Click Add under List of certificates in server pool and scroll down to the Upload the certificate as text section. There, paste the certificate and the private key parts into the corresponding fields. Click Upload Certificate when you have finished.

      certtext.PNG

  4. Click [Change] next to Certificate for securing mail > select an uploaded certificate > click OK. Now mail server is secured with an SSL certificate.

    Screenshot_2019-01-21_SSL_TLS_Certificates_-_Plesk_Onyx_17_8_11_1___1_.png

 

Tweet
Share
Share
Email
0 Shares
Read the full article
Related Posts

How to Host a Go App on Plesk

Read More »

Getting Started With Plesk Extensions & Tools

Read More »

The Plesk WP Toolkit 5.6 Release – What’s New

Read More »
Knowledge Base

Unable to send mail from Plesk server: deferred (delivery temporarily suspended: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused)

Read More »

Unable to issue a Let’s Encrypt certificate for a domain or its mail in Plesk: the DNS challenge used another IP address

Read More »

Let’s Encrypt notification mail: Your certificate (or certificates) for the names listed below will expire in days

Read More »

Email header analysis reports SPF failed for localhost IP on mail sent from Plesk hosted mailbox: SPF Authentication : SPF Failed for IP – 127.0.0.1

Read More »

Hosting Wiki

  • Django
  • Content Security Policy ( CSP )
  • Server Redundancy
  • QMAIL
  • Sendmail
  • Google Cloud CDN
  • Bare Metal Server
  • Oracle VM Server
  • Server Virtualization Software
  • Windows Server
  • Linux
  • MongoDB
  • Domain
  • Plesk
  • Web Server
  • DNS Server
  • SSL
  • Email Autoresponder
  • Mailing Lists
  • Email Alias
  • Email Virus Protection
  • Email Forwarding
  • Webmail

Industry
Partners

industry-partner_ALIBABA
industry-partner_GOOGLEPARTNER
industry-partner_MICROSOFT
industry-partner_REDHAT-r2
industry-partner_ALIBABA
industry-partner_AUTOMATTIC
industry-partner_AWS
industry-partner_DIGITALOCEAN
industry-partner_SCALEWAY
Follow us:
Facebook Twitter Linkedin Youtube Github

COMPANY

About Plesk
Our Brand
Legal
Careers
Impressum

PRODUCT

Pricing 
Extensions
What’s new

KNOWLEDGE BASE

Documentation
Help Center
Migrate to Plesk
Contact Us
Hosting Wiki
Preview releases

PROGRAMS

Contributor Program NEW
Partner Program
Affiliate ProgramNEW

COMMUNITY

Blog
Forums 
Plesk University

First defaul

Company

About Plesk
Our Brand
Legal
Careers
Impressum

PRODUCT

Pricing 
Extensions
What’s new

KNOWLEDGE BASE​

Documentation
Help Center
Migrate to Plesk
Contact Us
Hosting Wiki
Preview releases

PROGRAMS​

Contributor Program NEW
Partner Program
Affiliate ProgramNEW

COMMUNITY​

Blog
Forums
Plesk University

Follow us:
Facebook Twitter Linkedin Youtube Github

© 2025 WebPros International GmbH. All rights reserved. Plesk and the Plesk logo are trademarks of WebPros International GmbH.

Managed with love with Plesk WP Toolkit