RBL is blocking legitimate email sending

Following problem: I am using zen.spamhaus.org. When users of my email server are on the road, it happens, that they can't send emails with weird failure messages, such as recipient's email address is not valid, etc.
After quite some time, I managed to trace the problem back to how apparently OSXS handles SMTP requests from dynamic ip addresses - if they are listed in the RBL, the connection is simply refused, before smtp authentication can be initiated.
I am wondering if I am alone or if others had similar issues and how they have resolved it (it works flawlessly if I turn the RBLs off - which is kind of pointless...)
Thanks
LL

Here we go:
I have to say, that although I have setup a self-signed cert, it does not work 100%.
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/libexec/postfix
debugpeerlevel = 2
enableserveroptions = yes
html_directory = no
inet_interfaces = all
localrecipientmaps =
luser_relay = blindmail
mail_owner = _postfix
mailboxsizelimit = 0
mailbox_transport = cyrus
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
mapsrbldomains =
messagesizelimit = 10485760
mydestination = $myhostname,localhost.$mydomain,localhost,[domain].com,[more domains]
mydomain = [domain].com
mydomain_fallback = localhost
myhostname = mail.[domain].com
mynetworks = 127.0.0.0/8,[serverip],192.168.254.0/24
newaliases_path = /usr/bin/newaliases
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
relayhost =
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = _postdrop
smtpdclientrestrictions = permit_mynetworks rejectrblclient zen.spamhaus.org rejectrblclient cbl.abuseat.org permit
smtpdenforcetls = no
smtpdpw_server_securityoptions = gssapi,cram-md5
smtpdrecipientrestrictions = permitsasl_authenticated,permit_mynetworks,reject_unauthdestination,permit
smtpdsasl_authenable = yes
smtpdtlsCAfile =
smtpdtls_certfile = /etc/certificates/f-e.com.crt
smtpdtls_keyfile = /etc/certificates/f-e.com.key
smtpduse_pwserver = yes
smtpdusetls = yes
unknownlocal_recipient_rejectcode = 550
virtualmailboxdomains = hash:/etc/postfix/virtual_domains
virtual_transport = lmtp:unix:/var/imap/socket/lmtp

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