[CentOS] Sendmail failing on home machine
John R Pierce
pierce at hogranch.com
Wed Nov 7 07:51:02 UTC 2007
Peter Loron wrote:
> I have a CentOS 5 machine at home, behind a NAT gateway. Among other
> things, I'm running mdadm in monitor mode to alert me to RAID
> failures. I want it to send messages to my main email address. Any
> messages I send from the home CentOS box to that email address are
> being rejected with this error:
> Deferred: 451 Could not complete sender verify callout
> My understanding is that the destination mail server is trying to
> connect back to the source email host via SMTP as an anti-spam check
> and is failing.
> My external IP is set up with a dynamic DNS entry, so I guess I could
> set up an MX record and actually receive mail on the home box, but I
> don't want to deal with the security issues or the spam.
> Any suggestions for allowing sendmail-dependent apps running on the
> home machine to be able to send mail?
configure your sendmail to use your ISP's mail server as a 'smarthost'.
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