postfix sending from local adress to intern without authentification

Discussion in 'Installation/Configuration' started by sence123, Nov 22, 2011.

  1. sence123

    sence123 New Member

    example valid local mailbox addresses:
    [email protected]
    [email protected]

    i can do from remote, sending a mail from the mailbox acc. [email protected] to [email protected] without authentification.

    how can i restrict this ?

    (see a lot of spambots, which try it with a valid local email adress oO)
    don't know where they get from but that is not my problem..
    (user mistakes :)
  2. falko

    falko Super Moderator ISPConfig Developer

  3. sence123

    sence123 New Member


    Hello Falko,

    i would say, that isn't totally correct.
    If someone can send from extern, and with an account wich one is local stored, to someone who is also stored locally, it should be necesary to "auth" him, before he can send.
    Or would you like, if i could impersonate my self as someone else?

    i could send with your Account to someone else, i think thats not okey.
    but if rfc doesn't handle this, could you please provide me some information how to force authentification for this?

    thanks and best regards
  4. falko

    falko Super Moderator ISPConfig Developer

    That's a weakness of the SMTP protocol that you can fake sender addresses. There's nothing you can do about it.

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