K800i Email with FastMail.fm

Having not used my trusty Sony Ericsson K800i for a few years, I decided to see if I could use the email feature on it to send photographs (uploading to blog, Tumblr, etc.). After configuring the FastMail account credentials and SSL for IMAP4 and SMTP, I was presented with TLS/SSL server certificate not authorized by known authority. Contact your email provider. 

To fix this I needed to

  1. Obtain the necessary certificate from FastMail. This actually needed to be obtained from DigiCert who are the CA (Certificate Authority).
  2. Upload the certificate to the handset via Bluetooth.

(1) I could do with a FreeBSD system, (2) I chose to do on my Windows 8.1 laptop with convenient Bluetooth. I could have done both on my old Macbook.

Download the certificate from DiGiCert.

$ wget https://www.digicert.com/CACerts/DigiCertHighAssuranceEVRootCA.crt

Convert it to PEM format.

$ openssl x509 -inform der -in DigiCertHighAssuranceEVRootCA.crt -out  DigiCertHighAssuranceEVRootCA.pem

Rename it to a format that is recognised by the K800i filesystem.

$ mv DigiCertHighAssuranceEVRootCA.pem DCHAEVR.crt

Now copy across to the Windows 8.1 machine. I used FileZilla to move everything with sftp. Once on the Windows machine, send DCHAEVR.crt across to the K800i via Bluetooth. I accepted the prompt on the handset to install the DigiCert certificate, then verified installation under Settings->General->Security->Certificates->Trusted certificates.

Finally, send email with no errors!

Many thanks to http://tjworld.net/wiki/SonyEricsson/K800i/InstallDigitalCertificate for details of how to install the actual certificate. I also referred to http://fastmail.wikia.com/wiki/ConfiguringFetchmail for details of the certificate but actually only needed the root certificate.

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