mail not send to gmail and ymail

Hi Till,
I am facing a problem in my mail server. That I can't send any mail to gmail and ymail from mail server. My server mail log give in bellow

Jan 11 10:10:25 mail postfix/smtp[21678]: D9ACD1BEADA6: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=17, delays=0.04/0.05/0/17, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 079621BEADD7)
Jan 11 10:10:25 mail postfix/qmgr[2769]: D9ACD1BEADA6: removed
Jan 11 10:10:41 mail postfix/smtp[21562]: connect to mx4.twitter.com[199.16.156.115]:25: Connection timed out
Jan 11 10:10:41 mail postfix/smtp[21562]: 83B0A1BEAAE3: to=<b0444dd8e56azizulquayum=[email protected]>, relay=none, delay=132958, delays=132898/0.15/60/0, dsn=4.4.1, status=deferred (connect to mx4.twitter.com[199.16.156.115]:25: Connection timed out)
Jan 11 10:10:41 mail postfix/smtp[21570]: connect to mx4.twitter.com[199.16.156.115]:25: Connection timed out
Jan 11 10:10:41 mail postfix/smtp[21570]: 668F01BEAD76: to=<b04455070a8info=[email protected]>, relay=none, delay=19561, delays=19500/0.25/60/0, dsn=4.4.1, status=deferred (connect to mx4.twitter.com[199.16.156.115]:25: Connection timed out)
Jan 11 10:10:42 mail postfix/smtp[21568]: connect to mta-02.sailthru.com[65.39.215.22]:25: Connection timed out
Jan 11 10:10:42 mail postfix/smtp[21568]: 715441BEAB04: to=<[email protected]>, relay=none, delay=128759, delays=128698/0.21/61/0, dsn=4.4.1, status=deferred (connect to mta-02.sailthru.com[65.39.215.22]:25: Connection timed out)
Jan 11 10:10:42 mail postfix/smtp[21575]: connect to alt1.aspmx.l.google.com[74.125.31.27]:25: Connection timed out
Jan 11 10:10:42 mail postfix/smtp[21576]: connect to alt1.aspmx.l.google.com[74.125.31.27]:25: Connection timed out
Jan 11 10:10:42 mail postfix/smtp[21575]: DCE771BEABC3: to=<[email protected]>, relay=none, delay=86761, delays=86699/0.29/61/0, dsn=4.4.1, status=deferred (connect to alt1.aspmx.l.google.com[74.125.31.27]:25: Connection timed out)
Jan 11 10:10:42 mail postfix/smtp[21576]: C052F1BEABA7: to=<[email protected]>, relay=none, delay=86761, delays=86700/0.3/61/0, dsn=4.4.1, status=deferred (connect to alt1.aspmx.l.google.com[74.125.31.27]:25: Connection timed out)
Jan 11 10:10:42 mail postfix/smtp[21582]: connect to smtp1.careerage.com[74.125.31.27]:25: Connection timed out
Jan 11 10:10:42 mail postfix/smtp[21582]: B982B1BEAC56: to=<[email protected]>, relay=none, delay=57361, delays=57300/0.32/61/0, dsn=4.4.1, status=deferred (connect to smtp1.careerage.com[74.125.31.27]:25: Connection timed out)
Jan 11 10:10:52 mail clamd[2565]: SelfCheck: Database status OK.
Jan 11 10:10:55 mail postfix/smtp[21563]: connect to mta6.am0.yahoodns.net[66.196.118.35]:25: Connection timed out
Jan 11 10:11:25 mail postfix/smtp[21563]: connect to mta7.am0.yahoodns.net[98.136.217.202]:25: Connection timed out
Jan 11 10:11:55 mail postfix/smtp[21563]: connect to mta6.am0.yahoodns.net[98.136.217.202]:25: Connection timed out
Jan 11 10:12:12 mail dovecot: pop3-login: Login: user=<[email protected]>, method=PLAIN, rip=103.230.104.12, lip=182.16.157.60
Jan 11 10:12:13 mail dovecot: POP3([email protected]): Disconnected: Logged out top=0/0, retr=0/0, del=0/96, size=17212693
Jan 11 10:12:15 mail dovecot: pop3-login: Login: user=<[email protected]>, method=PLAIN, rip=103.230.104.12, lip=182.16.157.60
Jan 11 10:12:16 mail dovecot: POP3([email protected]): Disconnected: Logged out top=0/0, retr=0/0, del=0/96, size=17212693
Jan 11 10:12:25 mail postfix/smtp[21563]: connect to mta7.am0.yahoodns.net[63.250.192.45]:25: Connection timed out
Jan 11 10:12:55 mail postfix/smtp[21563]: connect to mta6.am0.yahoodns.net[66.196.118.37]:25: Connection timed out
Jan 11 10:12:55 mail postfix/smtp[21563]: 079621BEADD7: to=<[email protected]>, relay=none, delay=151, delays=0.1/0.01/151/0, dsn=4.4.1, status=deferred (connect to mta6.am0.yahoodns.net[66.196.118.37]:25: Connection timed out)

Please help me for solve this problem.

Thanks