On 15.08.11 15:02, Sam Varshavchik wrote: >Date: Mon, 15 Aug 2011 15:02:41 -0400 >From: Sam Varshavchik <[email protected]> >To: [email protected] >Subject: Re: [courier-users] > ESMTP_USE_STARTTLS error question > >Matus UHLAR - fantomas writes: > >>What error does courieresmtp generate now, when it envounters STARTTLR >>error with SMTP server? >>Can I turn on fallback to plaintext SMTP, when courier encounters such >>error? >> >>While I would like to use TLS where possible, I'm ok without it - >>we currently send all mail without TLS now :) > >There are several possibilities. If the STARTTLS command itself >fails, it's an SMTP error no difference then any other SMTP error, >and will be either permanent or transient depending on its numerical >code. If the STARTTLS command succeeds, but TLS negotiation fails, >its a permanent error. But in either case there is really no fallback >path. > >For practical purposes TLS for SMTP is fundamentally broken. Many TLS >servers simply use self-signed certs, making TLS fundamentally >useless as means for effective encryption. >
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