Openpgp: inline or s/mime encryption
I have imported a public key in my openpgp key-management/ In my settings of the end -to-end keys: preference of key technology: choose auto the key technology by the available keys. I have read openpgp standard supports inline en s/mime encryption but what is used by thunderbird when I choose openpgp as key encryption when i type/send an email (w/o attachment by myself). I ask it because my correspondent only decrypts inline encryption.
الحل المُختار
As I understand your question: You are using OpenPGP. You send an encrypted message. Your correspondent cannot decrypt the message.
Thunderbird does not support sending PGP/INLINE. PGP/INLINE is limited in what it can do. It doesn't support attachments, it doesn't support HTML emails.
Thunderbird uses PGP/MIME when sending an OpenPGP encrypted message. PGP/MIME is more flexible. Thunderbird uses PGP/MIME, because this encryption mode that can be used with any kind of message structure.
If your correspondent cannot decrypt PGP/MIME, then it would be best if your correspondent switches to a different email client.
If you really must send PGP/INLINE encrypted email, then currently you must use an external OpenPGP software to create a PGP/INLINE message, and then tell Thunderbird to send a plain text message, and then you can copy/paste your PGP/INLINE message into the message.
(Note that S/MIME is a different encryption technology, which is incompatible with OpenPGP.)
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الحل المُختار
As I understand your question: You are using OpenPGP. You send an encrypted message. Your correspondent cannot decrypt the message.
Thunderbird does not support sending PGP/INLINE. PGP/INLINE is limited in what it can do. It doesn't support attachments, it doesn't support HTML emails.
Thunderbird uses PGP/MIME when sending an OpenPGP encrypted message. PGP/MIME is more flexible. Thunderbird uses PGP/MIME, because this encryption mode that can be used with any kind of message structure.
If your correspondent cannot decrypt PGP/MIME, then it would be best if your correspondent switches to a different email client.
If you really must send PGP/INLINE encrypted email, then currently you must use an external OpenPGP software to create a PGP/INLINE message, and then tell Thunderbird to send a plain text message, and then you can copy/paste your PGP/INLINE message into the message.
(Note that S/MIME is a different encryption technology, which is incompatible with OpenPGP.)
Hi Kai, Thanks for your clear answer. My correspondent answered he could not decrypt my email and the reason will be openPGP uses PGP/MIME as you explained.