SendMail: Connection refused by []

I followed the procedure to Integrate Amazon SES with Sendmail in Ubuntu as given in the guide. The error log at /var/log/mail.log shows this error: Apr 26 18:57:42 ABC sendmail[21040]: 33QDRMnm021040:, ct (0/0), delay=00:00:20, xdelay=00:00:00, mailer=relay, pri=30060, relay=[] [], dsn=4.0.0, stat=Deferred: Connection refused by [] This error was caused by the wrong placement

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