cluster1.us.messagelabs.com[216.82.251.43]:25: Connection timed out

Hello.

I am Matsumoto, the mail administrator.
I work for a Japanese company.

I can't mail to "messagelabs.com". I would like you to investigate.

--------
From(SMTP Server):
52.197.128.153

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To:
*.us.messagelabs.com

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Error example:

Action: failed
Status: 4.4.1
Diagnostic-Code: X-Postfix; connect to
    cluster1.us.messagelabs.com[216.82.251.43]:25: Connection timed out

Action: failed
Status: 4.4.1
Diagnostic-Code: X-Postfix; connect to
    cluster5.us.messagelabs.com[216.82.250.83]:25: Connection timed out

From cluster1 to cluster?.

There was no problem at this site.

http://ipremoval.sms.symantec.com/lookup/

I think that it is probably blocked.