I am concerning more specifically for what are the specific parameters to
optimize outgoing mass emails in exim.conf ?
Is there any way to throttle outgoing emails ?
Thank you.
On Tue, Jul 17, 2012 at 8:19 PM, Chris Knadle <Chris.Knadle@???>wrote:
> On Tuesday, July 17, 2012 02:21:43, Muhammad Irfan wrote:
> > I normally sends mass no. of emails via script twice per day (around
> 40000
> > emails) each email contains one recipient.
> > And my script will sleep for 5 seconds after every 1000 emails. I noticed
> > many exim processes running when script exeuctes
> > and around 20-30% emails stucks in queue and server load is quite high
> > during mass mailing.
> > What are the specific parameters to optimize outgoing mass emails ? Is
> > there any way to throttle outgoing emails ?
> >
> > Furhter, i noticed stuck(queued) emails logs describes.
> >
> > * Recipient address rejected: Greylisted for 2 minutes
> > * 451 Temporary local problem - please try later
> > * R=dkim_lookuphost defer (-1): host lookup did not complete
> >
> > To me it's look likes recipient addresses are not accepting my emails.
>
> Sort of, and not exactly.
>
> > Probably DNS, RDNS or SPF issue. right or wrong ?
>
> I don't think this is RDNS or SPF is related.
>
>
> * Greylisting:
> https://en.wikipedia.org/wiki/Greylisting
>
>
>
> * "451 Temporary local problem - please try later" is usually the response
> when a local configuration error has been reached. So for instance if you
> have written an ACL rule that has an error in it and an incoming SMTP
> connection reaches it, a "Temporary local problem" will result.
>
>
>
> * With DKIM the verifier uses DNS to retrieve the signer's public key to
> verify the signed mail.
>
> DKIM:
> https://en.wikipedia.org/wiki/DomainKeys_Identified_Mail
>
> The lookup failing likely means the DNS lookup timed out. DNS [normally]
> uses
> UDP which means the packets are not guaranteed to arrive, so these can get
> lost if (for instance) the packet queue on the router or switch is full
> such
> that some incoming packets have to be dropped.
>
> > and for successfull outgoing emails normally log describes
> > * SMTP Outbound Connection ..
> > what does that means ?
>
> Without context it's hard to know, but it sounds like what it says -- that
> an
> outbound SMTP connection is/was made.
>
> -- Chris
>
> --
> Chris Knadle
> Chris.Knadle@???
>
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