Encrypted Communication will only work if bot ends habe set up their devices and own
a key pair. If your contact hasn't set up Encrypted Communication yet, you can
invite him to do so.
Inviting other GMX contacts to Encrypted Communication
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In your inbox, click Settings.
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Click
Security and
Encryption.
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Click
Invite Contacts.
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Enter your contact's email address.
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Confirm by clicking
Send Invite.
Setting up Encrypted Communication with non GMX contacts
You can use Encrypted Communication with anyone using up to date PGP software.
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Start by sending your public key to your contact. Click your browser's mailvelop icon and hit
Settings.
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Open the settings
Show Keys section and click on your Key.
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Switch to the
Export Tab and click
Download.
The downloaded file ("pub.asc") holds your public key.
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Send this file as an attachment to your contact. Ask him to do the same by sending you his key as an .asc file.
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Save your contact's .asc file on your computer.
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Click your browser's mailvelop icon and hit
Settings.
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Open the
Import Keyssection and click
Select Key file for import.
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Select your contact's .asc file and click
Open.
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Click
Import.
Your contact's public key will bei imported.
You now can compose and send encrypted email to other contacts.