Server App: Outgoing Mail Relay not working

Hi,
I'm trying to set up Outgoing Mail Relay on my Mountain Lion Server, but I always get bounced emails:
Oct 1 04:33:34 my.server.private postfix/smtp[9582]: C855DCE700D: to=<[email protected]>, relay=mx2.sub5.homie.mail.dreamhost.com[208.113.200.128]:25, delay=0.91, delays=0/0.02/0.65/0.24, dsn=5.7.1, status=bounced (host mx2.sub5.homie.mail.dreamhost.com[208.113.200.128] said: 554 5.7.1 Service unavailable; Client host [myIP] blocked using zen.dnsbl; http://www.spamhaus.org/query/bl?ip=myIP (in reply to RCPT TO command))
If I use in the SMTP servers list of Mail app, the exact same account credentials, the email is been delivered only when using SSL. So, I tried adding :465 and :587 to the ougoing relay server in the Server app (Relay outgoing mail throught ISP), but I get the following error and the message stays queued:
Oct 1 04:13:41 my.server.private postfix/smtp[8920]: connect to mx2.sub5.homie.mail.dreamhost.com[208.113.200.128]:587: Connection refused
Oct 1 04:13:41 my.server.private postfix/smtp[8920]: connect to mx1.sub5.homie.mail.dreamhost.com[208.113.200.127]:587: Connection refused
Oct 1 04:13:41 my.server.private postfix/smtp[8920]: 0BAD1CE6340: to=<[email protected]>, relay=none, delay=369, delays=369/0.02/0.43/0, dsn=4.4.1, status=deferred (connect to mx1.sub5.homie.mail.dreamhost.com[208.113.200.127]:587: Connection refused)
It seems I'm missing something. I want to use smtp account to send all the email coming from my Mac OS X Server, but it looks like I'm doing something wrong or the Server App doesnt work the same way Mail App does when connecting to a SMTP server.
Any comments?

Let me add....
Mail app is connecting and sending the emails correctly with the same credentials but using SSL through port 25:
READ Oct 01 05:04:01.566 [kCFStreamSocketSecurityLevelTLSv1SSLv3] -- host:my.externalrelayserver.net -- port:25 -- socket:0x7f890be0c620 -- thread:0x7f890ca3dd70
250-homiemail-a45.g.dreamhost.com
250-PIPELINING
250-SIZE 40960000
250-ETRN
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250 8BITMIME
WROTE Oct 01 05:04:01.588 [kCFStreamSocketSecurityLevelTLSv1SSLv3] -- host:my.externalrelayserver.net -- port:25 -- socket:0x7f890be0c620 -- thread:0x7f890ca3dd70
AUTH PLAIN (*** 48 bytes hidden ***)
READ Oct 01 05:04:01.793 [kCFStreamSocketSecurityLevelTLSv1SSLv3] -- host:my.externalrelayserver.net -- port:25 -- socket:0x7f890be0c620 -- thread:0x7f890ca3dd70
235 2.7.0 Authentication successful
I would like to force Server App to do a SSL connection to port 25 of the specified relay server, but not sure how to do this. If I don't manage to do SSL on port 25, then, my relay server will bounce the emails...
grrrr!

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