LMTP Support #267
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rfc: https://www.rfc-editor.org/rfc/rfc2033 Expand https://docs.kumomta.com/reference/kumo/make_queue_config/protocol/ to allow specifying that lmtp should be used. Add an LHLO method similar to kumomta/crates/rfc5321/src/client.rs Line 415 in 2037371 Teach kumomta/crates/kumod/src/smtp_dispatcher.rs Lines 337 to 341 in 2037371 |
wez
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This enables LMTP over TCP by setting `use_lmtp = true` in the egress path configuration. refs: #267
wez
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One frustration I have with the Rust standard library types is that while it has a SocketAddr type, that type doesn't include unix domain addressing like the underlying unix OS does in the underlying system type. I understand why it is that way, it's still a bit of a PITA. Since we want to enable the use of unix domain sockets for outbound LMTP support, our internal addressing type needs to be able to represent a unix domain address. This commit introduces our own HostAddress (equivalent to IpAddr, but not limited to IP addresses) and SocketAddress (equivalent to SockAddr, but not limited to IP sockets) types. The ResolvedAddress type has been cut over from IpAddr to HostAddress and the fan out addressed. This commit does not add support for establishing unix domain connections, it is merely the ability to recognize/report on them. refs: #267
wez
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This commit allows setting the queue config to use a unix domain socket
path:
```
protocol = {
smtp = {
mx_list = { '/some/path' },
},
},
```
and the smtp dispatcher will attempt to connect to it via a unix domain
socket.
It is anticipated that this will be used together with an egress path
config set to `use_lmtp = true`.
I've tested the ability to attempt to connect, but I don't have a
convenient implementation of SMTP/LMTP to test against here, so all I've
tested if that we can successfully fail to connect to a unix domain
socket.
refs: #267
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