feature request: support STARTTLS for LMTP preauth'd connection

qyb qiuyingbo at gmail.com
Tue Jun 14 05:16:14 EDT 2016

I use "lmtpd -a" listen on a NIC interface and receive lmtp request from a
remote postfix instance. Now preauth works, but mail data was transfered
without encryption.

I guess the commit your mentioned disabled startssl because the author
think we just need ssl to protect PLAIN Password auth request.. Personally,
I think all mail data should be encrypted in internet transfer.

On Tue, Jun 14, 2016 at 9:25 AM, ellie timoney via Cyrus-devel <
cyrus-devel at lists.andrew.cmu.edu> wrote:

> On Wed, Jun 1, 2016, at 03:28 AM, qyb via Cyrus-devel wrote:
> I noticed that cyrus disable TLS on preauth'd connection.
> Authentication info(plain password...) need TLS protection. And I think
> that RFC822 text also need TLS.
> Can you expand on this a bit?
> As far as I understand, connections are only ever preauth'd when they come
> in via UNIX-domain sockets, which are inherently local.  What are you
> trying to protect, and from whom?
> For what it's worth, it looks like STARTTLS used to work (at least to some
> degree) for preauth'd LMTP, but was explicitly disabled in 2001 by this
> commit:
> https://cgit.cyrus.foundation/cyrus-imapd/commit/?id=b93e6be5b19362f9e295b40ceb81b702d73de6bb
> So I guess you might be able to re-enable it by doing the inverse of that,
> though I'm not really seeing the point?
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