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Old 22nd November 2011, 12:56
sence123 sence123 is offline
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Default postfix sending from local adress to intern without authentification

Hello,
example valid local mailbox addresses:
test@example.net
test@example2.net

i can do from remote, sending a mail from the mailbox acc. test@example.net to test@example2.net without authentification.

how can i restrict this ?

thanks.
(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 :-)
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Old 23rd November 2011, 13:15
falko falko is offline
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http://www.howtoforge.com/forums/sho...30&postcount=4
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Old 23rd November 2011, 15:19
sence123 sence123 is offline
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Default re

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?

e.g:
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
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Old 25th November 2011, 17:43
falko falko is offline
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Default

Quote:
Originally Posted by sence123 View Post
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?

e.g:
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
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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