分享大量寄賀卡信後，出現錯誤訊息，與解決方式，給各位用戶參考。

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訊息一
[2011/1/31 上午 09:01:15] [3676] 傳送郵件從 XXX@XXX.com.tw 到 XXX@ms75.hinet.net(msa.hinet.net) 失敗 (421 Too many SMTP sessions for this host)[2]

訊息二
[2011/1/31 上午 09:01:14] [3260] 傳送郵件從 XXX@XXX.com.tw 到 XXX@msa.hinet.net(msa.hinet.net) 失敗 (421 Service not available, closing transmission channel)

訊息三
This is a return mail sent by system automatically, please do not reply this mail.
Your mail can not be delivered successfully due to the reason below:

Response message:
To: xxxx@xxxxx.com
Subject: 新年快樂
Reason: Timeout for attempting to re-send in 2 times.
Remote host: msa.hinet.net
Details: 421 Too many SMTP sessions for this host

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