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I have all the mail coming in from one domain to one mailbox, on my mail server (Postfix). I need it to be duplicated to an external mailbox (at least locally).

Please tell me, which way to dig?

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The question is a bit vague, but near as I can tell, you are receiving mail from "" to "" and what to carbon-copy all inbound email to "".

Easiest solution is to put an alias in front of the receiving address, then specify both the local address and the remote address in the alias. The entry will look something like this (but not exactly):

localuser: localuser,

Place the entry in the /etc/aliases file, then run newaliases.

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You can try sender_bcc_maps:

Create file /etc/postfix/sender_bcc with contents:

add to

sender_bcc_maps = /etc/postfix/sender_bcc


postmap /etc/postfix/sender_bcc
postfix reload

After that all incoming mails from will be copied (bcc) to address

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