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I got a new VPS setup and I'm wondering why I can't send emails to yahoo and gmail. Here's the error in /var/log/maillog:

00:43:00 mylamp sendmail[32507]: o45Gh0nc032505: to=, ctladdr= (48/48), delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=120405, relay=alt4.gmail-smtp-in.l.google.com. [74.125.79.27], dsn=4.0.0, stat=Deferred: Connection refused by alt4.gmail-smtp-in.l.google.com

What seems to be the problem?

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Could be your IP got black-listed by a previous owner of your VPS's IP. Common for an un-managed VPS to be compromised by a spammer or other blackhat activity in the wild.

Edit: Also, make sure your reverse DNS (rDNS) is set up properly, as big SMTP servers will need this to verify you are who you say you are.

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