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RFC 3207 (STARTTLS) question

2005-08-22 13:02:31

On reviewing T. Schorr's suggestion, I read this paragraph a few times:

  The decision of whether or not to believe the authenticity of the
  other party in a TLS negotiation is a local matter.  However, some
  general rules for the decisions are:

  -  A SMTP client would probably only want to authenticate an SMTP
     server whose server certificate has a domain name that is the
     domain name that the client thought it was connecting to.

Now... I have a server that is an MX host for half-a-dozen domains, and has about 3 A records pointing to it (why is a long history).

How does my server know which certificate to present to the client, so that the above general rule is satisfied?

(For the MX case, the answer might be "content of the MX record" rather than "domain that contains the MX record" - doesn't help for the A case, and is not obvious from the text)

Am I missing something obvious?


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