OpenBSD 5.1 released(openbsd.org)

    #
    # /etc/postfix/main.cf
    #
    # disable diff service
    biff = no

    # TLS parameters
    smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
    smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
    smtpd_use_tls=yes
    smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
    smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

    # disable warnings about NIS on mail delivery (default adds nis:mail.aliases)
    alias_maps = hash:/etc/aliases

    # do not grant special privileges to hosts except localhost
    mynetworks_style = host

    #set the mailbox size to limit to `unlimited'
    mailbox_size_limit = 0

    myhostname = fulla.mrothe.de
    mydestination = $myhostname, localhost.$mydomain, localhost,
                    mrothe.de

    mailbox_command = procmail -a "$EXTENSION"

    [...]
    
    myhostname = blei.mrothe.de
    #don't touch mydestination, which defaults to "$myhostname, localhost.$mydomain, localhost"

    # accept mail for these domains to be relayed
    relay_domains = $mydestination, mrothe.de