Table: mail_tags

Contains the mapping between the mail messages and the tags assigned to them.

> Columns

• mail_id: integer, unique
  Unique internal identifier of the message. This is a foreign key to mail.mail_id.

• tag: integer, not null
  Unique internal identifier of a tag. This is a foreign key to tags.tag_id.

• agent: integer
  Unique internal identifier of the operator or agent that assigned the tag to the mail. Null if it was automatically assigned by a filter rule.

• date_insert: timestamptz
  Date and time of the insertion.

> Size

Contains one entry per assigned tag, for each. Should grow linearly with the mail table, but really depends on the use of tagging.