メールエラーのパターン

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Sorry, I wasn't able to establish an SMTP connection. (#4.4.1)
I'm not going to try again; this message has been in the queue too long.
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202.xxx.xxx.xxx does not like recipient.
Remote host said: 550 5.1.1 <xxxxxx@xxx.so-net.ne.jp>... User unknown
Giving up on 202.xxx.xxx.xxx.
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This is the Postfix program at host xxx.xxx.ne.jp.

I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the message returned below.

            The Postfix program

<xxx@xx.xxx.ne.jp>: host xxx.xxx.xxx.ne.jp[xxx.xxx.xxx.xxx] said: 550
    <xxx@xx.xxx.ne.jp>: Recipient address rejected: User unknown in local
    recipient table (in reply to RCPT TO command)

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216.xxx.xxx.xxx failed after I sent the message.
Remote host said: 554 delivery error: dd This user doesn't have a yahoo.com account (xxx@yahoo.com) [-5] - mtaxxx.mail.xxx.yahoo.com

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単純にタイプミス

Sorry, I couldn't find any host named yafoo.co.jp. (#5.1.2)

--- Below this line is a copy of the message.

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222.xxx.xxxx.xxx does not like recipient.
Remote host said: 550 <xxx@ezweb.ne.jp>: User unknown
Giving up on 222.xxx.xxx.xxx.

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125.xxx.xxx.xxx does not like recipient.
Remote host said: 554 5.7.1 <xxx@xxx.ocn.ne.jp>: Recipient address rejected: Access denied
Giving up on 125.xxx.xxx.xxx.
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送信先のメールボックスが一杯のため、送信できませんでした。

※本メールはau one netのメールシステムより配信しております。
このメールには直接返信いただけません。

（　以下、サーバから出力されたエラーメッセージ　）

Your mail sent on: Fri, 10 Oct 2008 22:18:14 +0900
     Could not be delivered to: <xxx@xxx.dion.ne.jp>
     As their mailbox is full.
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203.xxx.xxx.xxx failed after I sent the message.
Remote host said: 550 Unknown user xxx@docomo.ne.jp
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65.xxx.xxx.xxx does not like recipient.
Remote host said: 550 Requested action not taken: mailbox unavailable
Giving up on 65.xxx.xxx.xxx.

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203.xxx.xxx.xxx failed after I sent the message.
Remote host said: 554 delivery error: dd Sorry your message to xxx@yahoo.co.jp cannot be delivered. This account has been disabled or discontinued [#102]. - mtaxxx.mail.xxx.yahoo.co.jp
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124.xxx.xxx.xxx failed after I sent the message.
Remote host said: 554 delivery error: dd This user doesn't have a yahoo.co.jp account (xxx@yahoo.co.jp) [-5] - mtaxxx.mail.xxx.yahoo.co.jp
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121.xxx.xxx.xxx does not like recipient.
Remote host said: 550 5.1.1 <xxx@xxx.co.jp> User unknown; rejecting
Giving up on 121.xxx.xxx.xxx.

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