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DNSBL on port 587

Is this still a problem?

http://forum.parallels.com/showthread.php?100849-SMTP-Auth-is-still-disabled-by-RBL-in-9-5-(Postfix)

I applied the workaround as detailed by hostsaurus, but this opens sasl auth on port 25 as well as 587.

Panel 11.5 add the permit_sasl_authenticated and permit_mynetworks flags to the smtpd_client_restrictions line.
# cat /etc/postfix/main.cf |grep smtpd_client
smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_rbl_client host1.tld, reject_rbl_client host2.tld

So, the issue from post you mentioned (SMTP Auth is still disabled by RBL in 9.5) is fixed in Panel 11.5
 
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