Postfix home server

If you have a mail server at home and your Internet service provider (ISP) has no right PTR record for your assigned IP, you will get trouble the most mail servers will reject you.

Some best examples for mail rejection: gmx.de, mail.ru

This problem can be solved, you can use a relay server, in other words a smarthost.
You need another server with white PTR record, your home server will send everything over the relay server.

This is a example config for home postfix servers:

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myhostname = firewall.zeldor.biz
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = firewall.zeldor.biz, ns.home.redirector.name, localhost.home.redirector.name, localhost
relayhost = 192.168.2.254
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
home_mailbox = Maildir/
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all

To be able to receive e-mails, you should set home_mailbox