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Editorial Team
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Asked: 2026-05-23T15:22:34+00:00

I’m writing service which will use for sending emails in my ASP.NET project. I

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I’m writing service which will use for sending emails in my ASP.NET project. I tested two approaches for autentification on Exchange:

  1. Since my service is running under
    local user I allowed for it an
    anonymous access and pass login and
    password to Exchange Server.
  2. Another way is domain authorization
    on Exchange: before I invoke
    smtpClient.Send() method I
    impersonate(in code) an exist domain
    user with access rights to sender
    mailbox.

All of this ways works well but I really little confused how it should be as a good scenario. If I have a feature for sending mail on my ASP.NET site and Exchange Server — what type of autentification on Exhcange user policy is preferable (1 or 2, …)?

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  1. Editorial Team

    Option 3: Configure your service to run with a domain user account.

    If so, this would be the preferred option, IMHO. Exchange can then be configured to allow access to a know domain user, avoiding the need to require anonymous access and, importantly, you don’t have to secure away credentials in your service configuration in order to impersonate a domain user.

    Indeed, you could configure your service to run under the security context of the user that you’re impersonating.

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