# messageId 和 emailId
messageId 是提交一次SMTP请求, 返回的消息编号.
emailId 是 SendCloud 投递一封邮件, 返回的邮件编号, 可以对应到某一次请求的某一个收件人.
两者的计算关系如下:
to = [A, B, C]
emailId_A = messageId + to.index(A) + '$' + A
emailId_B = messageId + to.index(B) + '$' + B
emailId_C = messageId + to.index(C) + '$' + C
# 注意:
* position 不做位数补齐
* 无论to中是否含有重复的值, 返回的emailId list 跟发送列表的顺序都是相同的.
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举例如下:
# to = ["ben@ifaxin.com", "joe@ifaxin.com", "bida@ifaxin.com", ... , "lianzimi@ifaxin.com"]
1425758592214_4576_32113_9310.sc-10_10_127_105-inbound # messageId
1425758592214_4576_32113_9310.sc-10_10_127_105-inbound0$ben@ifaxin.com # emailId
1425758592214_4576_32113_9310.sc-10_10_127_105-inbound1$joe@ifaxin.com # emailId
1425758592214_4576_32113_9310.sc-10_10_127_105-inbound2$bida@ifaxin.com # emailId
...
1425758592214_4576_32113_9310.sc-10_10_127_105-inbound99$lianzimi@ifaxin.com # emailId
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