August 22, 2003

J-Phone のメールサーバー

Webを使ったビジネスを企画すると、必ずといっていいほど必要になるのが、メール配信機能だ。ナマケモノエンジニアとしては、車輪の再発明をするのが大嫌いなので、だいぶ前にemailの大量配信エンジンを作ってみた。APIを呼び出すと、JMSでキューを管理して、時間指定やら設定に応じて、メール送信サーバーが分散並列に送りまくる仕組みで、SPAM屋さんが喜びそうな仕様である。

それを使って、勤務先のサービスとして、お客さんのメール配信代行みたいなことをやっているのだが、なにげに MRTG で眺めていると、最近妙にキューの掃けが悪いことに気がついた。

同僚の調査によると、携帯電話の J-Phone アドレス向けのキューだけ、ぜんぜん配信されてない。300通くらいの配信に、丸一日近くかかってる。

配送の log を見てみると、あるとき突然 J-Phone のメールサーバーが、完全にこちらからの接続をブロックしてしまうのだ。再送をかけると、送れるときもあるが、またすぐにブロックされてしまう。送信に失敗するほど待機時間を長くして再送するようにしていたので、どんどん待機間隔が長くなって、全部の配送完了まで非常に時間がかかる…てな状況。

どうやら、いわゆる J-Phone の「迷惑メール対策」らしいのだが、User Unknown なメールを5通くらい送ると、J-Phone のメールサーバーはウチからのコネクションを受け入れないようになって、その後15分くらいはダンマリなまま。えー、たった5通でオテアゲかよ!

なので、お客から預かったメールアドレス(もちろん全部オプトイン済)の中に、メールアドレスを変更したり解約したりして、既に不達の J-Phone アドレスが混じっていると、その他の J-Phone アドレスへの送信に、異常に時間がかかることに。

そりゃー、電話番号ジェネレーターでメールを送りまくる業者もいるし、おかげで J-Phone のメールサーバーは過負荷でいつもパンパンだって噂も聞くし、迷惑メールが地球上の全メールの50%を超えたなんて調査もあるから、何か対策が必要なことはわかるんだけど、あまりに困った仕様だなぁ。

DoCoMo の場合は 特定接続サービス が出来たおかげで、一時期にくらべ配信がだいぶスムースになったけど、J-Phone には同様のサービスすらない。どないせいっちゅーねん。ベッカムなんかCMに使う金があったら、メールサーバーに金かけんかい! それともアレか、ベッカム様が、うちのメールもゴールに運んでくださるってか、オラ。

…って、別に俺は J-Phone の顧客でも何でもないので、そんなこと言えませんが。
Vodafone に変わったら、マシになるのかなぁ。期待ageしとくか。

とりあえず J-Phone アドレスのメールは全部集めて、 serialmail で送りつつ、ダンマリくらったら17分間隔でリトライするように設定することで、多少マシになった。エラーになったアドレスを抽出することは出来ているので、フィルタしちゃえばよいのだけど、こちらはお客様と相談しないことにはナントモ。

Posted by ryo at August 22, 2003 02:08 PM | TrackBack (1)
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