SKS OpenPGP Key server VS Enigmail

The place to publish and search OpenPGP public keys.

Security extension to Mozilla Thunderbird and SeaMonkey

Decentralized Network
The SKS OpenPGP Key server is part of a decentralized network, which means it doesn't rely on a single point of failure and can continue to provide services even if parts of the network go down.
Open Source
The software running on SKS Key servers is open source, allowing users to review the code for security flaws or implement improvements, enhancing transparency and trustworthiness.
Interoperability
The SKS Key server network allows for interoperability with other OpenPGP-compliant software and servers, making it easier to share public keys across different systems and users.
Automated Key Synchronization
Keys uploaded to any SKS server are synchronized automatically across the network, ensuring widespread availability and ease of use for those searching for public keys.

Data Inaccuracy
Since anyone can upload keys, the network can contain outdated or inaccurate data, which could result in trust issues if users find and use invalid keys.
Lack of Key Revocation
Once a key is submitted to the SKS server, it's difficult to remove, including revoked keys, which can continue to be distributed and potentially misused.
Privacy Concerns
The open nature of the server means that uploaded keys and some associated metadata are publicly visible, which can raise privacy concerns for individuals sensitive to exposure.
Limited Metadata Management
The SKS Key server software has limited ability to manage or verify the authenticity of metadata associated with keys, which can impact the trustworthiness of the information provided.

Enhanced Security
Enigmail provides strong encryption for emails, enhancing privacy and security by using OpenPGP standards.
Integration with Thunderbird
Seamlessly integrates with Mozilla Thunderbird, providing a user-friendly interface for sending and receiving encrypted messages.
Digital Signature
Allows users to sign their messages digitally, ensuring authenticity and integrity of the correspondence.
Open Source
Being an open-source project, Enigmail allows users and developers to examine and improve the software's security.
Wide User Base
Has a broad community of users and developers, which often leads to faster identification and resolution of bugs and vulnerabilities.

Complex Setup
Initial configuration can be challenging, especially for users unfamiliar with encryption concepts and key management.
Limited Support
Limited technical support options as it relies primarily on community-based support which may not be timely.
Platform Limitation
Primarily designed for use with Thunderbird on desktop platforms, offering limited functionality for webmail or other email clients.
Learning Curve
Users may face a steep learning curve when using PGP encryption and managing keys, especially if they are new to encryption.
Dependency on Thunderbird
Users must rely on Mozilla Thunderbird, as Enigmail is not available as an independent email client or plugin for other clients.