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Open SourceYes
Pros
Pro Excellent but...
Open source (the free version of openPgp), other similar products are offered for other platforms (Gpg4win for Windows for example). It is the most secure way to send emails today, close to military encryption. Some negative points: not all mail clients support it and when a key is not only on your hard disk but also on a server (pgp.mit.edu for example), it is complicated to remove it.
Last positive point: it can also be used other than for emails, to encrypt and sign documents. Bitcoin releases are signed with the GPG keys of the developers ;)
Know any positive aspects of this option?
Cons
Know any negative aspects of this option?
Recommendations
GNU Privacy Guard
Recommended 10 months ago
Pro
Cross-platformPro
Excellent but... Pro
Supports paired keysPro
Volume and individual file encryptionPro
Supports expiring signaturesPro
Both CLI and GUI versions availablePro
Open-source and battle-testedCon
It may be hard to find a GUI frontend that suits your needs