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Block sending to external mail addresses using Postfix under Linux


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#1
Diego8

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Hi.
Does anyone know if there's a way to block an specific internal e-mail address from sending mail to external addresses using Postfix under Ubuntu Linux?
To be a little bit more clear what i'm trying to do is blocking [email protected] from sending e-mail to any domain except mydomain.com

Any help would be greatly appreciated.
Thanks.
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#2
Kemasa

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Most likely there is a way to do it, but how difficult is the real question. I have what you wanted in sendmail, but I have not used postfix. Since the source is available, you can make any change that you want.

This might be the area in which you need to look at:

http://www.postfix.o..._relayhost_maps

You might also want to check out the mailing lists and archives:

http://www.postfix.org/lists.html
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#3
Diego8

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Thanks!. That was really useful.
The sender_dependent_relayhost_maps parameter allowed me to block a list of users from sending mail to outside.
Now i'm trying to figure out how to block outsiders from sending mail to them.
Unfortunately there's no "recipient_dependent_relayhost_maps" thing. I guess i will have to deal with header_checks or something.
Never mind, i'll try to post at the postfix list.

Thanks for the help.
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