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improve training of junk filter

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before, we used heuristics to decide when to train/untrain a message as junk or
nonjunk: the message had to be seen, be in certain mailboxes. then if a message
was marked as junk, it was junk. and otherwise it was nonjunk. this wasn't good
enough: you may want to keep some messages around as neither junk or nonjunk.
and that wasn't possible.

ideally, we would just look at the imap $Junk and $NotJunk flags. the problem
is that mail clients don't set these flags, or don't make it easy. thunderbird
can set the flags based on its own bayesian filter. it has a shortcut for
marking Junk and moving it to the junk folder (good), but the counterpart of
notjunk only marks a message as notjunk without showing in the UI that it was
marked as notjunk. there is also no "move and mark as notjunk" mechanism. e.g.
"archive" does not mark a message as notjunk. ios mail and mutt don't appear to
have any way to see or change the $Junk and $NotJunk flags.

what email clients do have is the ability to move messages to other
mailboxes/folders. so mox now has a mechanism that allows you to configure
mailboxes that automatically set $Junk or $NotJunk (or clear both) when a
message is moved/copied/delivered to that folder. e.g. a mailbox called junk or
spam or rejects marks its messags as junk. inbox, postmaster, dmarc, tlsrpt,
neutral* mark their messages as neither junk or notjunk. other folders mark
their messages as notjunk. e.g. list/*, archive. this functionality is
optional, but enabled with the quickstart and for new accounts.

also, mox now keeps track of the previous training of a message and will only
untrain/train if needed. before, there probably have been duplicate or missing
(un)trainings.

this also includes a new subcommand "retrain" to recreate the junkfilter for an
account. you should run it after updating to this version. and you should
probably also modify your account config to include the AutomaticJunkFlags.
This commit is contained in:
Mechiel Lukkien
2023-02-11 23:00:12 +01:00
parent a4306ef783
commit bf04fb8a1a
26 changed files with 410 additions and 157 deletions
Download Patch File Download Diff File Expand all files Collapse all files

89
store/account.go
View File

@ -276,8 +276,9 @@ type Message struct {
MessageHash []byte // Hash of message. For rejects delivery, so optional like MessageID.
Flags
Size int64
MsgPrefix []byte // Typically holds received headers and/or header separator.
Size int64
TrainedJunk *bool // If nil, no training done yet. Otherwise, true is trained as junk, false trained as nonjunk.
MsgPrefix []byte // Typically holds received headers and/or header separator.
// ParsedBuf message structure. Currently saved as JSON of message.Part because bstore
// cannot yet store recursive types. Created when first needed, and saved in the
@ -299,6 +300,48 @@ func (m Message) LoadPart(r io.ReaderAt) (message.Part, error) {
return p, nil
}
// NeedsTraining returns whether message needs a training update, based on
// TrainedJunk (current training status) and new Junk/Notjunk flags.
func (m Message) NeedsTraining() bool {
untrain := m.TrainedJunk != nil
untrainJunk := untrain && *m.TrainedJunk
train := m.Junk || m.Notjunk && !(m.Junk && m.Notjunk)
trainJunk := m.Junk
return untrain != train || untrain && train && untrainJunk != trainJunk
}
// JunkFlagsForMailbox sets Junk and Notjunk flags based on mailbox name if configured. Often
// used when delivering/moving/copying messages to a mailbox. Mail clients are not
// very helpful with setting junk/notjunk flags. But clients can move/copy messages
// to other mailboxes. So we set flags when clients move a message.
func (m *Message) JunkFlagsForMailbox(mailbox string, conf config.Account) {
if !conf.AutomaticJunkFlags.Enabled {
return
}
lmailbox := strings.ToLower(mailbox)
if conf.JunkMailbox != nil && conf.JunkMailbox.MatchString(lmailbox) {
m.Junk = true
m.Notjunk = false
} else if conf.NeutralMailbox != nil && conf.NeutralMailbox.MatchString(lmailbox) {
m.Junk = false
m.Notjunk = false
} else if conf.NotJunkMailbox != nil && conf.NotJunkMailbox.MatchString(lmailbox) {
m.Junk = false
m.Notjunk = true
} else if conf.JunkMailbox == nil && conf.NeutralMailbox != nil && conf.NotJunkMailbox != nil {
m.Junk = true
m.Notjunk = false
} else if conf.JunkMailbox != nil && conf.NeutralMailbox == nil && conf.NotJunkMailbox != nil {
m.Junk = false
m.Notjunk = false
} else if conf.JunkMailbox != nil && conf.NeutralMailbox != nil && conf.NotJunkMailbox == nil {
m.Junk = false
m.Notjunk = true
}
}
// Recipient represents the recipient of a message. It is tracked to allow
// first-time incoming replies from users this account has sent messages to. On
// IMAP append to Sent, the message is parsed and recipients are inserted as
@ -528,14 +571,10 @@ func (a *Account) WithRLock(fn func()) {
// If sync is true, the message file and its directory are synced. Should be true
// for regular mail delivery, but can be false when importing many messages.
//
// if train is true, the junkfilter (if configured) is trained with the message.
// Should be used for regular mail delivery, but can be false when importing many
// messages.
//
// Must be called with account rlock or wlock.
//
// Caller must broadcast new message.
func (a *Account) DeliverX(log *mlog.Log, tx *bstore.Tx, m *Message, msgFile *os.File, consumeFile, isSent, sync, train bool) {
func (a *Account) DeliverX(log *mlog.Log, tx *bstore.Tx, m *Message, msgFile *os.File, consumeFile, isSent, sync bool) {
mb := Mailbox{ID: m.MailboxID}
err := tx.Get(&mb)
xcheckf(err, "get mailbox")
@ -544,6 +583,9 @@ func (a *Account) DeliverX(log *mlog.Log, tx *bstore.Tx, m *Message, msgFile *os
err = tx.Update(&mb)
xcheckf(err, "updating mailbox nextuid")
conf, _ := a.Conf()
m.JunkFlagsForMailbox(mb.Name, conf)
var part *message.Part
if m.ParsedBuf == nil {
mr := FileMsgReader(m.MsgPrefix, msgFile) // We don't close, it would close the msgFile.
@ -629,13 +671,10 @@ func (a *Account) DeliverX(log *mlog.Log, tx *bstore.Tx, m *Message, msgFile *os
xcheckf(err, "sync directory")
}
if train {
conf, _ := a.Conf()
if mb.Name != conf.RejectsMailbox {
err := a.Train(log, []Message{*m})
xcheckf(err, "train junkfilter with new message")
}
}
l := []Message{*m}
err = a.RetrainMessages(log, tx, l, false)
xcheckf(err, "training junkfilter")
*m = l[0]
}
// write contents of r to new file dst, for delivering a message.
@ -969,7 +1008,7 @@ func (a *Account) DeliverMailbox(log *mlog.Log, mailbox string, m *Message, msgF
m.MailboxOrigID = mb.ID
changes = append(changes, chl...)
a.DeliverX(log, tx, m, msgFile, consumeFile, mb.Sent, true, true)
a.DeliverX(log, tx, m, msgFile, consumeFile, mb.Sent, true)
return nil
})
// todo: if rename succeeded but transaction failed, we should remove the file.
@ -988,7 +1027,7 @@ func (a *Account) DeliverMailbox(log *mlog.Log, mailbox string, m *Message, msgF
//
// Caller most hold account wlock.
// Changes are broadcasted.
func (a *Account) TidyRejectsMailbox(rejectsMailbox string) (hasSpace bool, rerr error) {
func (a *Account) TidyRejectsMailbox(log *mlog.Log, rejectsMailbox string) (hasSpace bool, rerr error) {
var changes []Change
err := extransact(a.DB, true, func(tx *bstore.Tx) error {
@ -1007,7 +1046,7 @@ func (a *Account) TidyRejectsMailbox(rejectsMailbox string) (hasSpace bool, rerr
remove, err := qdel.List()
xcheckf(err, "listing old messages")
changes = a.xremoveMessages(tx, mb, remove)
changes = a.xremoveMessages(log, tx, mb, remove)
// We allow up to n messages.
qcount := bstore.QueryTx[Message](tx)
@ -1027,7 +1066,7 @@ func (a *Account) TidyRejectsMailbox(rejectsMailbox string) (hasSpace bool, rerr
return hasSpace, err
}
func (a *Account) xremoveMessages(tx *bstore.Tx, mb *Mailbox, l []Message) []Change {
func (a *Account) xremoveMessages(log *mlog.Log, tx *bstore.Tx, mb *Mailbox, l []Message) []Change {
if len(l) == 0 {
return nil
}
@ -1048,8 +1087,18 @@ func (a *Account) xremoveMessages(tx *bstore.Tx, mb *Mailbox, l []Message) []Cha
// Actually remove the messages.
qdm := bstore.QueryTx[Message](tx)
qdm.FilterIDs(ids)
var deleted []Message
qdm.Gather(&deleted)
_, err = qdm.Delete()
xcheckf(err, "deleting from message recipient")
xcheckf(err, "deleting from messages")
// Mark as neutral and train so junk filter gets untrained with these (junk) messages.
for i := range deleted {
deleted[i].Junk = false
deleted[i].Notjunk = false
}
err = a.RetrainMessages(log, tx, deleted, true)
xcheckf(err, "training deleted messages")
changes := make([]Change, len(l))
for i, m := range l {
@ -1077,7 +1126,7 @@ func (a *Account) RejectsRemove(log *mlog.Log, rejectsMailbox, messageID string)
remove, err := q.List()
xcheckf(err, "listing messages to remove")
changes = a.xremoveMessages(tx, mb, remove)
changes = a.xremoveMessages(log, tx, mb, remove)
return err
})