Postfix port: lmtp stopped working after update from 3.6

[marcus_(_dot_)_lindemann_(_at_)_arcor_(_dot_)_de]

Hi all,
I've just upgraded from OBSD 3.6 to 3.7 on i386. For that reason I also updated postfix and cyrus (both from packages). Before updating my packages, I removed the old ones as described in the FAQ.
Unfortunately, after the upgrade postfix fails with following message:
postfix/lmtp[21043]: B8AEF8721: to=<mli_(_at_)_shebang_(_dot_)_de>, orig_to=<mli>, relay=none, delay=1, status=deferred (connect to /var/imap/socket/lmtp[/var/imap/socket/lmtp]: No such file or directory).

Googling around hints to a permission problem, however (sudo is needed because I did this as an ordinary user, that is not in the mail group)
obelix(ttyp1)> sudo ls -ld /var /var/imap /var/imap/socket /var/imap/socket/lmtp
drwxr-xr-x  28 root   wheel  512 Aug 25  2004 /var
drwxr-x---  11 cyrus  mail   512 Oct 20 20:33 /var/imap
drwxr-xr-x   2 cyrus  mail   512 Oct 20 19:33 /var/imap/socket
srwxrwxrwx   1 root   mail     0 Oct 20 19:33 /var/imap/socket/lmtp

obelix(ttyp1)> id _postfix
uid=507(_postfix) gid=507(_postfix) groups=507(_postfix), 6(mail)

obelix(ttyp1)> id cyrus
uid=1002(cyrus) gid=6(mail) groups=6(mail)

Any ideas what could go wrong here?

On a side note:
On 3.6 my config directory was /etc/postfix, but after upgrading I also found /etc/ports/postfix. Now I wonder, which is the right config directory. According to postconf, it should be /etc/postfix, but then, what is /etc/ports/postfix for?

obelix(ttyp1)> postconf | grep config
alternate_config_directories =
config_directory = /etc/postfix

Thanks
Marcus

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