because this mechanism is most needed behind a reverse proxy, where acme
tls-alpn-01 won't work (because the reverse proxy won't pass on the alpn
extensions). if that's the case, there is obviously a webserver on port 443.
and it likely also running on port 80. so before this change, if tls-alpn-01
isn't available, http-01 also wasn't available, leaving no validation
mechanisms.
for issue #218 by mgkirs, thanks for reporting and details. hope this helps.
when we send a list of messages from the mox backend to the js frontend, we
include a parsed form of the "initial" message: the one we immediately show,
typically the top-most (unread) message. however, if that message could not be
parsed (due to invalid header syntax), we would fail the entire operation of
loading the view.
with this change, we simply don't return a parsed form of an initial message if
we cannot parse it. that will cause the webmail frontend to not select &
display a message immediately. if you then try to open the message, you'll
still get an error message as before. but at least the view has been loaded,
and you can open the raw message to inspect the contents.
for issue #219 by wneessen
not generating it yet from imapserver because we don't have content-md5
available. we could send "nil" instead of any actual content-md5 header (and
probably no contemporary messages include a content-md5 header), but it would
not be correct. if no known clients have problems in practice with absent
extensible data, it's better to just leave the bodystructure as is, with
extensible data.
for issue #217 by danieleggert
we add various information while analysing an incoming message. like
dkim/spf/ip reputation. and content-based junk filter threshold/result and
ham/spam words used.
for issue #179 by Fell and #157 by mattfbacon
there is only an internet-draft about the required behaviour. it says clients
should ignore the strings. some clients do check the string. most servers
appear to use "Username:" and "Password:" as challenge. we'll follow them,
hoping to improve interoperability.
for issue #223 by gdunstone, and with analysis from wneessen of go-mail.
thanks!
this is a typical case if you made an alias to test how it works, with your
account. we may have to make this behaviour optional in the future.
for issue #220 by wneessen, thanks for reporting!
for some errors during the scram authentication protocol, we would treat some
errors that a client connection could induce as server errors, printing a stack
trace and aborting the connection.
this change recognizes those errors and sends regular "authentication failed"
or "protocol error" error messages to the client.
for issue #222 by wneessen, thanks for reporting
otherwise, if the recipient was a bcc, there's no good way to see why the
message was received.
incoming webhooks already have this rcptto field, but that's not always the
moment you want to process it.
for mattanja on matrix, thanks for reporting!
we didn't announce starttls as capability, but clients can still try them. we
would try to do a handshake with a nil certificate, which would cause a
goroutine panic (which is handled gracefully, shutting down the connection).
found with code that was doing starttls unconditionally.
these singleusetokens can be redeemed once. so when you see it in the logs, it
can't be used again. they are short-lived anyway.
this change should help prevent me periodically investigating token handling...
before, we would just say "session expired". now we say "session expired (after
12 hours inactivity)" (for admin) or "session expired (after 24 hours
inactivity)" for account/webmail. for unknown sessions in the admin interface,
we also explain that server restarts and 10 more new sessions can be the
reason.
for issue #202 by ally9335
since we have more of our own styling (probably since dark mode), we weren't
indicating anymore that a button was disabled. this actually only applies to
the button for the current mailbox of a message, when attempting to move it.
we now don't show any hover effects in that case, and we show the button
semitransparent.
with new field "AlternativeFiles" in the JSON body, or with "alternativefile" form file uploads.
can be used if there is a (full) alternative representation (alternative to
text and/or html part), like a calendar item, or PDF file.
for issue #188 by morki
instead of failing the connection because no certificates are available.
this may improve interoperability. perhaps the remote smtp client that's doing
the delivery will decide they do like the tls cert for our (mx) hostname after
all.
this only applies to incoming smtp deliveries. for other tls connections
(https, imaps/submissions and imap/submission with starttls) we still cause
connections for unknown sni hostnames to fail. if case no sni was present, we
were already falling back to a cert for the (listener/mx) hostname, that
behaviour hasn't changed.
for issue #206 by RobSlgm
if icloud.com has your ip blocklisted, it will close the smtp connection after
writing a response to RCPT TO, before writing a response to a pipelined DATA
command. this is similar to the case (already handled) where a mail server
would close the connection after a response to MAIL FROM when pipelined.
we now recognize this situation (unexpected EOF before we get a response to
DATA, with all RCPT TO's failed), and treat the last response to RCPT TO as the
result.
for issue #198 by soheilpro, thanks for reporting and sending an smtpclient
trace that showed the behaviour.
as they occur in From/To headers, for example: "From:
=?iso-8859-2?Q?Krist=FDna?= <k@example.com>". we are using net/mail to parse
such headers. most address-parsing functions in that package will only decode
charsets utf-8, iso-8859-1 and us-ascii. we have to be careful to always use
net/mail.AddressParser with a WordDecoder that understands more that the
basics.
for issue #204 by morki, thanks for reporting!
we are using Go's net/mail to parse message headers. it can parse addresses,
and properly decodes email addresses with double quotes (e.g. " "@example.com).
however, it gives us an address without the double quotes in the localpart,
effectively an invalid address. we now have a workaround to parse such
not-quite-addresses.
for issue #199 reported by gene-hightower, thanks for reporting!
some emails have text and html versions. the html can have several logo images.
and there may be a pdf attached. when gathering attachments to show in webmail,
the pdf would come last. it could happen the logo images would get a link to
click, and the pdf would be behind the "more ..." button. by putting
"multipart/mixed" files before the "multipart/related" in the list, it's more
likely that useful files can be clicked immediately, and unimportant logo files
are behind the "more"-button.
before, the iframe was consuming the mouse events, preventing the dragging to
the right from working properly. the workaround was to drag over the area with
the header, above the message iframe.
with this change, we disable pointer events over the entire right area, which
includes the iframe.
by sending the (encoded) string "User Name" as mentioned by the internet-draft,
https://datatracker.ietf.org/doc/html/draft-murchison-sasl-login-00#section-2.1
that document says clients should ignore the challenge (which is why were were
not doing any effort and sending an empty challenge). but it also says some
clients require the challenge "Username:" instead of "User Name", implying that
it's important to not send an empty challenge. we can't send both challenges
though...
for issue #51
for issue #186 by morki, thanks for reporting and providing sample favicons.
generated by the mentioned generator at favicon.io, with the ubuntu font and a
fuchsia-like color.
the favicon is served for listeners/domains that have the
admin/account/webmail/webapi endpoints enabled, i.e. user-facing. the mta-sts,
autoconfig, etc urls don't serve the favicon.
admins can create webhandler routes to serve another favicon. these webhandler
routes are evaluted before the favicon route (a "service handler").
before, the suggested records would show "v=spf1 mx ~all", while the dnscheck
page would suggest "v=spf1 ip4:... ip6:... -all".
the two places now show the same record: explicitly listing the configured ip's
(so the common case of a valid message is fast and doesn't require lookups of
mx hosts and their addresses), but still including "mx" (may prevent issues
while migrating to new ips in the future and doesn't hurt for legit messages),
and "~all" (for compatibility with some old systems that don't look at
dkim/dmarc when they evaluate spf and reach "-all")
based on #176 created by rdelaage, with record mismatch spotted by RobSlgm,
thanks!
if no host keys are configured, show as warning (yellow) that dane isn't
configured, and show instructions to enable it.
for issue #185 by morki, thanks for reporting!
the suggested dns records mention that these records are optional, but the
dnscheck makes it look serious. not helpful.
also remove unneeded whitespace in list of errors/warnings.
for issue #184 by morki, thanks for reporting!
