exim4: ずっと出力されていたエラーに対処

mail.errにこういうエラーが、ずっとでている:

Jun 18 06:25:06 myhost exim4: ALERT: exim paniclog /var/log/exim4/paniclog
has non-zero size, mail system possibly broken

paniclogはこんな感じ。2年前から更新されてないみたい:

2016-08-27 04:40:20 1bdMz9-00077o-QH failed to fork automatic delivery process: Cannot allocate memory
2016-08-27 04:45:15 1bdN3y-00078J-C8 failed to fork automatic delivery process: Cannot allocate memory
2016-08-27 04:50:29 1bdN93-00078Y-CG failed to fork automatic delivery process: Cannot allocate memory
2016-08-27 04:55:08 1bdNDY-00078l-LH failed to fork automatic delivery process: Cannot allocate memory
2016-08-27 04:58:10 1bdNGT-00078t-Ck failed to fork automatic delivery process: Cannot allocate memory
2016-08-27 05:00:16 1bdNIU-000792-VA failed to fork automatic delivery process: Cannot allocate memory
2016-08-27 05:00:46 1bdNIx-000795-TT failed to fork automatic delivery process: Cannot allocate memory
2016-08-27 05:04:15 1bdNMN-00079D-69 failed to fork automatic delivery process: Cannot allocate memory
2016-08-27 05:05:10 1bdNNG-00079I-Gf failed to fork automatic delivery process: Cannot allocate memory

exim4はメール送信用に導入したので、当時の設定過程でなにかあったんでしょう... paniclogはここに記録しておいて、削除しました。

効果があったか、確認が必要ですね。