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3.  Table: attachments

Contains one entry for each attachment. The actual attachments contents are stored in a dedicated table: attachment_contents.

Structure of attachments

attachment_id

integer PRIMARY KEY

Unique internal identifier for the attachment.

mail_id

integer

The internal unique ID of the mail message to which the attachment belongs.

REFERENCES mail

content_type

character varying(300)

The mime type of the attachment such as 'image/jpeg', 'text/plain', 'message/rfc822'...

content_size

integer

The attachment's size in bytes.

filename

character varying(300)

The attachment's filename, if present.

charset

character varying(30)

The character set for text contents (when content_type starts with 'text/'). Typical values are 'utf-8', 'iso-8859-1', 'us-ascii', ...

mime_content_id

text

A string identifying the MIME part's content_id for the attachment. Other attachments may refer to this ID. For example HTML parts use <img src="cid:content_id_of_part"> to embed an attached picture. The use and syntax of content-ID is described in RFC 2392.

Tables referencing attachment_contents via Foreign Key Constraints