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sendmail: dh key too small

Solution Verified - Updated -

Issue

openssl ライブラリーをアップデートすると、sendmail が外部サーバーに接続することができません。

sendmail[123]:STARTTLS=client:645:error:14082174:SSL routines:SSL3_CHECK_CERT_AND_ALGORITHM:dh key too small:s3_clnt.c:2429:

そしてメッセージが配信されません。

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • sendmail
  • openssl

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