On 2022-07-08, Stuart Henderson <stu.lists@spacehopper.org> wrote:
> You are missing the intermediate certificate on the server.
visually:
imap - presents an intermediate cert, providing a path to the trusted root cert
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Certificate chain
0 s:/CN=mail.thinkerwim.org
i:/C=US/O=Let's Encrypt/CN=R3
1 s:/C=US/O=Let's Encrypt/CN=R3
i:/C=US/O=Internet Security Research Group/CN=ISRG Root X1
2 s:/C=US/O=Internet Security Research Group/CN=ISRG Root X1
i:/O=Digital Signature Trust Co./CN=DST Root CA X3
---
smtp - doesn't
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Certificate chain
0 s:/CN=mail.thinkerwim.org
i:/C=US/O=Let's Encrypt/CN=R3
---
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