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Editorial Team
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Asked: 2026-06-17T16:49:27+00:00

I’m using centos 5 and sendmail on intranet server. Local mail is being delivered

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I’m using centos 5 and sendmail on intranet server. Local mail is being delivered perfectly, but when i try to deliver email to gmail, for example (or any other service outside intranet) i find following errors in my logs:

Jan 16 16:50:32 testlink sendmail[27713]: r0GCoVi5027711: to=<example@gmail.com>,
ctladdr=<webdev@testlink.ru.corp.domain.com> (502/502), delay=00:00:01,
xdelay=00:00:01, mailer=esmtp, pri=120332, relay=alt4.gmail-smtp-in.l.google.com.
[173.194.68.27], dsn=4.0.0, stat=Deferred: 
Connection refused by alt4.gmail-smtp-in.l.google.com.

one more important thing – server is not accessible from internet, but i can access internet from my server..

Please advice where should i search the problem.. i understand that i should setup sendmail somehow (currently i’m using default configuration that was set by yum), but what settings (or at least direction)… Thanks in advance!

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1 Answer

  1. Editorial Team

    run ifconfig in command line. perhaps something is wrong with your IP

    also look into iptables -L

    netstat -nap should have a string

    tcp        0      0 0.0.0.0:25                  0.0.0.0:*                   LISTEN      5275/sendmail

    check if provider blocks port 25:

    telnet smtp.ukr.net 25
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