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11.  Table: header

Each mail message has a header that consists of a list of Name: Value lines. It is from these lines that information such as the subject, the recipients, the sender, or the date of the message are extracted. The header table contains the decoded header for each message. The lines are unfolded, so the newline character can be seen as an effective separator between successive entries. The lines are also decoded so that they no longer contain quoted-printable or base64 contents, and they're converted to the database character set (UTF-8).

Structure of header

mail_id

integer Unique internal identifier of the message. REFERENCES mail

lines

text The decoded contents of the entire header of the message. Lines are separated by newline characters (ASCII code=10).