Design

Objects

thread objects

Originator fields ( rfc5322#section-3.6.2 )

from            =   "From:" mailbox-list CRLF
sender          =   "Sender:" mailbox CRLF
reply-to        =   "Reply-To:" address-list CRLF

Destination Address Fields ( rfc5322#section-3.6.3 )

to              =   "To:" address-list CRLF
cc              =   "Cc:" address-list CRLF
bcc             =   "Bcc:" [address-list / CFWS] CRLF

Informational Fields ( rfc5322#section-3.6.5 )

subject         =   "Subject:" unstructured CRLF
comments        =   "Comments:" unstructured CRLF
keywords        =   "Keywords:" phrase \*("," phrase) CRLF

The Identification Fields ( rfc5322#section-3.6.3 ) are not implemented here. Instead, the thread object contains a list of sorted hash pointing to the different messages.

mail objects

data replication model

• [ ] ditributed centralized mono db

  (1 database owning all mailboxes)

  • security issues

  • scalability issue

  • no replication issue

• [ ] user centric mailbox database

  (1 database per users mailbox)

  • replication issues (replication only between user device and service provider is not enough)

  • no scalability issue

  • easier security

  • sounds shitty

• [X] thread centric database

  (1 database per email thread)

  • reduced footprint

  • replication is ideal (between sender and receivers for all exchanges)

  • more complex to implement

  • more security possibilities (more complex?)

Flow design

Receive from legacy (MX to DEFMS)

    .------.
    | IMAP |
    '------'
       |
      \ /
       '
.---------------.
| defms-gateway |
'---------------'
       |
      \ /
       '
.---------------.
| defms mailbox |
'---------------'
       |
      \ /
       '
.--------------.
| defms-daemon |
'--------------'
       |
      \ /
       '
    .------.
    | IPFS |
    '------'

Send to legacy (DEFMS to MX)

.--------------.
| defms-daemon |  ---------------.
'--------------'                 |
       |                         |
      \ /                       \ /
       '                         '
.---------------.         .---------------.
| defms-gateway |         | defms-sentbox |
'---------------'         '---------------'
       |                         |
      \ /                       \ /
       '                         '
    .------.                  .------.
    | SMTP |                  | IPFS |
    '------'                  '------'

Send to DEFMS (DEFMS to DEFMS)

.--------------.
| defms-daemon |
'--------------'
       |
      \ /
       '
.---------------.
| defms mailbox |
'---------------'
       |
      \ /
       '
.--------------.
| defms-daemon |
'--------------'