we only compress if applicable (content-type indicates likely compressible),
client supports it, response doesn't already have a content-encoding).
for internal handlers, we always enable compression. for reverse proxied and
static files, compression must be enabled per handler.
for internal & reverse proxy handlers, we do streaming compression at
"bestspeed" quality (probably level 1).
for static files, we have a cache based on mtime with fixed max size, where we
evict based on least recently used. we compress with the default level (more
cpu, better ratio).
due to logic bug we weren't setting it, and tls connections would fail with a
warning that either the remote hostname must be set or insecurityskipverify
must be set.
because outlook.com will reformat the message and then fail to verify the message.
proton.me also reformats and invalidates the dkim signature, but seemingly
after it verifies the dkim signature.
the commit before the previous added tests with a message with only 1 header
line. it's a valid message, but Go's mail.ReadMessage doesn't handle it with
go1.20 and earlier. the automated "test with previous go release" caught it.
work around it by adding the expected but absent \r\n to the parse function.
some time ago, the flag to ParseConfig() to do or skip checking the tls
keys/certs was inverted, but it looks like i didn't change the call sites... so
during "mox config test", and after a regular "mox quickstart" there was no
check for the tls keys/certs, and during "mox quickstart -existing-webserver"
there was a check where there shouldn't be. this made using -existing-webserver
impossible.
this became clear with the question by morki in issue #5.
NATIPs lists the public IPs, so we can still do the DNS checks on them. with
IPsNATed, we disabled the checks.
based on feedback by kikoreis in issue #52
the recent webmail addition added localserve local delivery in queue.Add, so we
just that for smtpserver too.
and don't drop incoming smtp deliver messages, but deliver as normal.
- padding on small attachment download button.
- don't remember "show html" but always display text first.
- propagate modseq to message when flags/keywords change, so "show internals" shows the update.
without public ip's, the generated mox config will try to listen on 0.0.0.0 and
::, but because there is already a listener for 127.0.0.1:80 (and possibly
others), a bind for 0.0.0.0:80 will fail. explicit public ip's are needed.
the public http listener is useful for ACME validation over http.
for issue #52
this is based on @bobobo1618's PR #50. bobobo1618 had the right idea, i tried
including an "is forwarded email" configuration option but that indeed became
too tightly coupled. the "is forwarded" option is still planned, but it is
separate from the "accept rejects to mailbox" config option, because one could
still want to push back on forwarded spam messages.
we do an actual accept, delivering to a configured mailbox, instead of storing
to the rejects mailbox where messages can automatically be removed from. one
of the goals of mox is not pretend to accept email while actually junking it.
users can still configure delivery to a junk folder (as was already possible),
but aren't deleted automatically. there is still an X-Mox-Reason header in the
message, and a log line about accepting the reject, but otherwise it is
registered and treated as an (smtp) accept.
the ruleset mailbox is still required to keep that explicit. users can specify
Inbox again.
hope this is good enough for PR #50, otherwise we'll change it.
soon, we can have multiple rejects mailboxes. and checking against the
configured rejects mailbox name wasn't foolproof to begin with, because it may
have changed between delivery to the rejects mailbox and the message being
moved.
after upgrading, messages currently in rejects mailboxes don't have IsReject
set, so they don't get the special rejecs treatment when being moved. they are
removed from the rejects mailbox after some time though, and newly added
rejects will be treated correctly. so this means some existing messages wrongly
delivered to the rejects mailbox, and moved out, aren't used (for a positive
signal) for future deliveries. saves a bit of complexity in the
implementation. i think the tradeoff is worth it.
related to discussion in issue #50
a few places still looked at the name "Sent". but since we have special-use
flags, we should always look at those. this also changes the config so admins
can specify different names for the special-use mailboxes to create for new
accounts, e.g. in a different language. the old config option is still
understood, just deprecated.
the bulk of a message is stored on disk. a message prefix is stored in the
database (for prefixed headers like "Received:"). this adds a check to ensure
Size = prefix length + on-disk file size.
verifydata also checks for this now.
and one older and one new (since yesterday) bug was found. the first when
appending a message without a header/body section (uncommon). the second when
sending messages from webmail with localserve (uncommon).
it was far down on the roadmap, but implemented earlier, because it's
interesting, and to help prepare for a jmap implementation. for jmap we need to
implement more client-like functionality than with just imap. internal data
structures need to change. jmap has lots of other requirements, so it's already
a big project. by implementing a webmail now, some of the required data
structure changes become clear and can be made now, so the later jmap
implementation can do things similarly to the webmail code. the webmail
frontend and webmail are written together, making their interface/api much
smaller and simpler than jmap.
one of the internal changes is that we now keep track of per-mailbox
total/unread/unseen/deleted message counts and mailbox sizes. keeping this
data consistent after any change to the stored messages (through the code base)
is tricky, so mox now has a consistency check that verifies the counts are
correct, which runs only during tests, each time an internal account reference
is closed. we have a few more internal "changes" that are propagated for the
webmail frontend (that imap doesn't have a way to propagate on a connection),
like changes to the special-use flags on mailboxes, and used keywords in a
mailbox. more changes that will be required have revealed themselves while
implementing the webmail, and will be implemented next.
the webmail user interface is modeled after the mail clients i use or have
used: thunderbird, macos mail, mutt; and webmails i normally only use for
testing: gmail, proton, yahoo, outlook. a somewhat technical user is assumed,
but still the goal is to make this webmail client easy to use for everyone. the
user interface looks like most other mail clients: a list of mailboxes, a
search bar, a message list view, and message details. there is a top/bottom and
a left/right layout for the list/message view, default is automatic based on
screen size. the panes can be resized by the user. buttons for actions are just
text, not icons. clicking a button briefly shows the shortcut for the action in
the bottom right, helping with learning to operate quickly. any text that is
underdotted has a title attribute that causes more information to be displayed,
e.g. what a button does or a field is about. to highlight potential phishing
attempts, any text (anywhere in the webclient) that switches unicode "blocks"
(a rough approximation to (language) scripts) within a word is underlined
orange. multiple messages can be selected with familiar ui interaction:
clicking while holding control and/or shift keys. keyboard navigation works
with arrows/page up/down and home/end keys, and also with a few basic vi-like
keys for list/message navigation. we prefer showing the text instead of
html (with inlined images only) version of a message. html messages are shown
in an iframe served from an endpoint with CSP headers to prevent dangerous
resources (scripts, external images) from being loaded. the html is also
sanitized, with javascript removed. a user can choose to load external
resources (e.g. images for tracking purposes).
the frontend is just (strict) typescript, no external frameworks. all
incoming/outgoing data is typechecked, both the api request parameters and
response types, and the data coming in over SSE. the types and checking code
are generated with sherpats, which uses the api definitions generated by
sherpadoc based on the Go code. so types from the backend are automatically
propagated to the frontend. since there is no framework to automatically
propagate properties and rerender components, changes coming in over the SSE
connection are propagated explicitly with regular function calls. the ui is
separated into "views", each with a "root" dom element that is added to the
visible document. these views have additional functions for getting changes
propagated, often resulting in the view updating its (internal) ui state (dom).
we keep the frontend compilation simple, it's just a few typescript files that
get compiled (combined and types stripped) into a single js file, no additional
runtime code needed or complicated build processes used. the webmail is served
is served from a compressed, cachable html file that includes style and the
javascript, currently just over 225kb uncompressed, under 60kb compressed (not
minified, including comments). we include the generated js files in the
repository, to keep Go's easily buildable self-contained binaries.
authentication is basic http, as with the account and admin pages. most data
comes in over one long-term SSE connection to the backend. api requests signal
which mailbox/search/messages are requested over the SSE connection. fetching
individual messages, and making changes, are done through api calls. the
operations are similar to imap, so some code has been moved from package
imapserver to package store. the future jmap implementation will benefit from
these changes too. more functionality will probably be moved to the store
package in the future.
the quickstart enables webmail on the internal listener by default (for new
installs). users can enable it on the public listener if they want to. mox
localserve enables it too. to enable webmail on existing installs, add settings
like the following to the listeners in mox.conf, similar to AccountHTTP(S):
WebmailHTTP:
Enabled: true
WebmailHTTPS:
Enabled: true
special thanks to liesbeth, gerben, andrii for early user feedback.
there is plenty still to do, see the list at the top of webmail/webmail.ts.
feedback welcome as always.
behaviour around failing DB calls that change data (insert/update) was changed
in bstore quite some time ago. the tx state in bstore would become inconsistent
when one or more (possibly unique) indexes had been modified, but then an
ErrUnique would occur for the next index. bstore doesn't know how to roll back
the partial changes during a transaction, so it marks the tx as botched and
refuses further operations. so, we cannot just try to insert, wait for a
possible ErrUnique, but then still try to continue with the transaction.
instead, we check if the record exists and only insert it if we couldn't find
it.
found while working on webmail.
as the recent Go patch release showed, textproto.ReadMIMEHeaders is parsing
http headers, strictly. too strict for email message headers. valid headers,
e.g. with a slash in them, were rejected by textproto.ReadMIMEHeaders.
the functions in Go's mail package handle RFC 2047 charset-encoded words in
address headers. it can do that because we tell it those headers are addresses,
where such encodings are valid. but that encoding isn't valid in all places in
all headers. for other cases, we must decode explicitly, such as for the
subject header.
with this change, some messages that could not be parsed before can now be
parsed (where headers were previously rejected for being invalid). and the
subject of parsed messages could now be properly decoded. you could run "mox
ensureparsed -all <account>" (while mox isn't running) to force reparsing all
messages. mox needs a subcommand to reparse while running...
it wasn't much of a problem before, because imap email clients typically do
their own parsing (of headers, including subject decoding) again. but with the
upcoming webmail client, any wrong parsing quickly reveals itself.
message.Part now has a ReaderUTF8OrBinary() along with the existing Reader().
the new function returns a reader of decoded content. we now use it in a few
places, including search. we only support the charsets in
golang.org/x/text/encoding/ianaindex.
search has also been changed to not read the entire message in memory. instead,
we make one 8k buffer for reading and search in that, and we keep the buffer
around for all messages. saves quite some allocations when searching large
mailboxes.
the space is explicitly mentioned as not valid in rfc 5321, but it clients do
send it, such as microsoft outlook 365 apps for enterprise. no need to punish
such users, we'll allow it. but only for submission, not regular smtp, because
it is normally a sign of a spammer. we still don't allow it in pedantic mode
(as used by localserve).
for issue #51 by hmfaysal, thanks for reporting and testing!
i always get bitten by some caching or missing checks when i use docker...
Dockerfile.moxmail doesn't exist anymore, but that doesn't matter, it doesn't
even look at it but will just use some image that is still around (based on the
name?) i suppose that means docker-compose also doesn't rebuild an image when
the dockerfile mentioned in the build changes.
accounts with a mailbox with this problem can be fixed by running the "mox
fixuidmeta <account>" command.
we were resetting the mailbox uidnext after delivering messages when we were
setting new keywords on the mailbox at the end of the import. so in a future
delivery attempt to that mailbox, a uid would be chosen that was already
present.
the fix is to fetch the updated mailbox from the database before setting the
new keywords.
http/import.go doesn't have this bug because it was already fetching the
mailbox before updating keywords (because it can import into many mailboxes,
so different code).
the "mox verifydata" command (recommended with backups) also warns about this
issue (but doesn't fix it)
found while working on new functionality (webmail).
at least the android gmail/mail app doesn't show messages without content-type
header. i believe missing content-type is meant to be interpreted as
text/plain, but doesn't hurt to be explicit.
