request for certificate extension

[Kazu Yamamoto ( 山本和彦 )]

Hello,

DoCoMo, the biggest cellular phone company in Japan, send messages
signed with S/MIME to users. If we verify a signature of a message
from DoCoMo, the verification process fails and the following warning
message is displayed.

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gpgsm: Signature made 2006-12-22 13:47:37 using certificate ID 64C04082
gpgsm: critical certificate extension 2.5.29.17 is not supported
gpgsm: invalid certification chain: Unsupported certificate
----

I don't know this well, but I found the following in RFC3280:

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341 06    3:           OBJECT IDENTIFIER subjectAltName (2 5 29 17)
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If possible, I would request to support this extension.

--Kazu