一封符合标准的 Email 大致是这个样子的:
Mail Header [define boundary "--123"]
2 eol
–123
header block 1 [define boundary "--456"]
2eol
–456
header block 1.1
2eol
content block 1.1
2eol
–456
header block 1.2
2eol
content block 1.2
2eol
–456–
2eol
–123
header block 2
2eol
content block 2
2eol
–123–
2eol
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