OT: fetching e-mails to local server

[[ISO-8859-2] Marcin Ro¿ek]

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Hello,
this is a bit off-topic, but i don't know where to ask this question...
The story: small firm have an e-mail server provided by their ISP. They
have few aliases eg. aaa at firm.pl bbb at firm.pl etc. that points to one
real account on that server. They also want to have their local e-mail
server  to send e-mails (and that works ok) but also want to have their
e-mails fetched from ISP-server to their local server. I'm not sure how
i can do this. I tried fetchmail, but it downloads all e-mails to one
account. But they want to download all e-mails from that one real
account and place it into real accounts on local server.

aaa at firm.pl and bbb at firm.pl goes to realaccount at firm.pl
I have to get all e-mails from realaccount and put e-mails that were
sent to eg. aaa at firm.pl to box aaa on local server.

Someone have an idea how to do that?
I appreciate any help.

ps. i was thinking about changing MX record to point to that 'local'
server but its IP is dynamic:(

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