Well.. I've managed to reduce our spam without the require_verify = sender
to about 2-3 spam emails per mailbox per day.
considering we were recieving them by the dozens, that is a huge improvement
by itself.
I run continious monitoring on few specific email accounts that were
reporting me about excessive spam and based upon their
current level of spam and their respnoses, they are very pleased with the
current results.
HOWEVER, after two more months or so, after everyone is OK with the current
filters, I'll look into enabling the require_verify = sender
to further minimize the spam, but that's only going to happen in at least
two more months.
I have to let my users 'chill' for a little bit. We had a RAID-5 controller
failure and we moved to a new server, so everyone is still
uneasy with changes. We don't want to rock the boat to much :))).
But thanks for the input. Later down the road it will be taken into
consideration as we tighten the filtering of mail.
Thanks,
-Alon.
> I have verify sender with callout and we have customers all over the
> world. We have had very little mail loss that is verifiable and when
> we do, almost 100% of the time we were able to get the offending
> server to "fix" itself to become conformant the RFCs regarding DSN
> and <> (every one that has failed for us has been someone who rejects
> <> sender as spam). We are a small provider and are not the best
> example due to how small we are compared to big mail providers but it
> has not been a real issue with us that it has disrupted mail service
> or caused problems. A handful of times we have pointed out to the
> offending senders that their servers are misconfigured (we always
> take the angle that we cannot accept mail from people who do not
> accept an appropriately sent DSN) and most of the time they have
> fixed their problem. We did have to whitelist one person whose
> provider is generally clueless about almost everything and one
> provider wouldn't even talk to us as we were not his customer... Our
> users/customers have greatly appreciated the service as well. We are
> always trying to improve our spam checks so as to not have to do a
> callout but the callout does greatly reduce the amount of spam we
> have to accept and deliver.
>
> Chad
>
> ---
> Chad Leigh -- Shire.Net LLC
> Your Web App and Email hosting provider
> chad at shire.net
>
>
>
>
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