On Oct 21, 2006, at 7:44 AM, Alon wrote: > Third, You made the point/case that: > > "Some very large / major ISP's do not have usable DNS records for > their > 'pools' of servers." > > NOW that's something to be concerned about. Since I'm running a shared > hosting environment with folks from > all over the world, it is very likely that some of them are > interacting with > servers that are indeed poorly maintained/configured. > That is a valid reason by itself why NOT to use this feature. > I can lecture to my clients that they SHOULD instruct their buddies > out > there to lecture their service providers... and yeah..going > back to reality this is never going to happen.
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 -- ## List details at http://www.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://www.exim.org/eximwiki/
