Author: Jeremy Harris Date: To: exim-users @ exim. org Subject: Re: [exim] 451 Resources temporarily unavailable
David Purton wrote: > Hi,
>
> I'm having trouble sending email to yahoo addresses. Sometimes messages go
> through ok, other times they seem to fail silently.
>
> I'm running exim-4.34 on a debian woody server.
>
> This is what I see in the logs, for messages that don't get through:
>
> 2005-07-29 18:32:09 1DyQkr-0006cl-Tu <= ***@haeseandharris.com.au H=*** [192.168.0.8] P=smtp S=2235 id=01da01c5941c$30fab8e0$0800a8c0@RAY
> 2005-07-29 18:32:14 1DyQkr-0006cl-Tu SMTP error from remote mailer after end of data: host mx3.mail.yahoo.com [4.79.181.12]: 451 mta110.mail.mud.yahoo.com Resources temporarily unavailable. Please try again later [#4.16.5].
> 2005-07-29 18:32:16 1DyQkr-0006cl-Tu => ***@yahoo.ca R=dnslookup T=remote_smtp H=mx3.mail.yahoo.com [64.156.215.5] 2005-07-29 18:32:16 1DyQkr-0006cl-Tu Completed
>
>
> This doesn't happen every time, sometimes the 451 error doesn't occur
> and the message goes through ok, even for the same user.
>
> I grant the above *looks* like it's doing the right thing - in that it
> gets a temporary error message, so it immediately tries another server
> which succeeds, except the the recipient seemingly doesn't get the
> message.
>
>
> Any ideas? Some of the messages that I getting dropped contain invoices
> for our products, so I need to figure out what is wrong quick :(
a) they're not getting dropped; your system retries them.
b) yahoo is doing the 451. It's not your fault and there's nothing you
can do about it.
c) email is not a trustworthy medium anyway; don't use it for invoices.
