Mails not reacing HOTMAIL.COM

[Esni]

How can I check if I'm on a blacklist?

----mail.log
ct 25 00:15:14 srv2 postfix/cleanup[3420]: 4261B215422E: message-id=<3027.83.245.169.83.1193260514.squirrel@domain.com>
Oct 25 00:15:14 srv2 postfix/qmgr[3410]: 4261B215422E: from=<username@domain.com>, size=1574, nrcpt=1 (queue active)
Oct 25 00:15:14 srv2 postfix/smtpd[3424]: disconnect from mail.local[127.0.0.1]
Oct 25 00:15:14 srv2 amavis[2436]: (02436-02) Passed CLEAN, [127.0.0.1] [83.245.169.83] <username@domain.com> -> <username@hotmail.com>, Message-ID: <3027.83.245.169.83.1193260514.squirrel@domain.com>, Hits: -, 275 ms
Oct 25 00:15:14 srv2 couriertcpd: Connection, ip=[::ffff:127.0.0.1]
Oct 25 00:15:14 srv2 postfix/smtp[3421]: 0D4E72154229: to=<username@hotmail.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.38, delays=0.09/0.01/0/0.28, dsn=2.6.0, status=sent (250 2.6.0 Ok, id=02436-02, from MTA: 250 2.0.0 Ok: queued as 4261B215422E)
Oct 25 00:15:14 srv2 postfix/qmgr[3410]: 0D4E72154229: removed
Oct 25 00:15:14 srv2 couriertcpd: LOGIN: ip=[::ffff:127.0.0.1], command=LOGIN
Oct 25 00:15:14 srv2 couriertcpd: LOGIN: ip=[::ffff:127.0.0.1], username=username@domain.com
Oct 25 00:15:14 srv2 couriertcpd: LOGIN, user=username@domain.com, ip=[::ffff:127.0.0.1], protocol=IMAP
Oct 25 00:15:14 srv2 couriertcpd: LOGOUT, user=username@domain.com, ip=[::ffff:127.0.0.1], headers=1411, body=0, rcvd=554, sent=4448, time=0
Oct 25 00:15:15 srv2 postfix/smtp[3426]: 4261B215422E: to=<username@hotmail.com>, relay=mx2.hotmail.com[65.54.245.40]:25, delay=1.7, delays=0.14/0.02/0.92/0.58, dsn=2.0.0, status=sent (250 <3027.83.245.169.83.1193260514.squirrel@domain.com> Queued mail for delivery)
Oct 25 00:15:15 srv2 postfix/qmgr[3410]: 4261B215422E: removed

domain.com=our domain
etc