how to send mail in google cloud hosting

I am using Google cloud hosting with laraval application. I have integrate mailgun for mail and proper working no any error . My issue is not receive mail when we have check server mail log

May 26 11:59:55 instance-1 sendmail[22013]: v4OGpxfB003667: to=, delay=1+19:07:56, xdelay=00:00:00, mailer=esmtp, pri=4088715, relay=alt4.gmail-smtp-in.l.google.com., dsn=4.0.0, stat=Deferred: Connection timed out with alt4.gmail-smtp-in.l.google.com.

I am using mailgun not gmail-smtp-in.l.google.com.

how to send mail ??

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