https://connect.mozilla.org/t5/discussions/digital-certificate-problem/m-p/116888#M45618 <PRE>&nbsp;</PRE><P>&nbsp;Solved!<BR />The problem was choosing the right security module from the many options available depending on the type of smart card.</P> Wed, 28 Jan 2026 14:20:39 GMT netfocom 2026-01-28T14:20:39Z https://connect.mozilla.org/t5/discussions/digital-certificate-problem/m-p/116879#M45611 <P>Hello, I installed Thunderbird ver.147&nbsp;<BR />I have a digital certificate /DC/, which I added according to the video tutorials. &nbsp;<BR />After trying to send a letter, I received&nbsp;an error message:<BR />The message was not sent.<BR />You want to encrypt the message, but the application cannot find a certificate for&nbsp;...</P><P>I can't understand where this error is coming from.</P> Wed, 28 Jan 2026 12:42:19 GMT https://connect.mozilla.org/t5/discussions/digital-certificate-problem/m-p/116879#M45611 netfocom 2026-01-28T12:42:19Z https://connect.mozilla.org/t5/discussions/digital-certificate-problem/m-p/116888#M45618 <PRE>&nbsp;</PRE><P>&nbsp;Solved!<BR />The problem was choosing the right security module from the many options available depending on the type of smart card.</P> Wed, 28 Jan 2026 14:20:39 GMT https://connect.mozilla.org/t5/discussions/digital-certificate-problem/m-p/116888#M45618 netfocom 2026-01-28T14:20:39Z