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| | | Forum Guru
Group: Forum Members
Last Login: 5/17/2008 3:46:03 AM
Posts: 1,608, Visits: 845 |
| | Picture an Imail server that is processing 150K messages per day. If an average SMTP session takes 7 seconds, that is an average of 12 SMTP sessions open per second. Now lets say you add graylisting with a value of 30 seconds. And lets say for purposes of this conversatation there is 1 SMTP session initiated per second that falls under gray listing. So now we take the average number of SMTP sessions open per second from 12 to 42. We have just trippled the load on the TCP/IP stack and the SMTP service. Yes, graylisting is a usefull tool. But like other tools, it can quickly become a problem source as well. Many of us firmly feel that these kind of tools/tests would better be suited at a gateway level rather than at the server itself.
John T
eServices For You"Life is a succession of lessons which must be lived to be understood." Ralph Waldo Emerson (1802-1882) |
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| | | Junior Member
Group: Forum Members
Last Login: 9/17/2007 2:35:01 PM
Posts: 12, Visits: 12 |
| | A few points First off in my case we handle around 5000 messages a day, so there is plenty of room for greylisting. Secondly, doesn't greylisting help reduce the overall bandwith and CPU to smtp servers. If we take an industry average of over 65% of all emails being SPAM, well then greylisting offloads the processing of all those messages from our servers, if they fall within the greylisting parameters. I agree a gateway greylisting device would be great, but for cases like ours small business (100 users) having the ability to greylist from withing the SMTP server as option would be much easier for us rather then investing in a second device for this. |
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Forum Member
Group: Forum Members
Last Login: 5/13/2008 6:27:23 AM
Posts: 41, Visits: 263 |
| Hello Nektar Meletakos, well done, all of your words are correct!  Hello John T, not all of us are big companies with a lot of traffic. In my opinion a professionell solution for SMTP must have Greylisting.
Alt least, using Greylisting is Admin's decision.
In IMAIL there are a lot of features with the option to use it or not. I'm asking me, why Ipswitch is blocking so hard to insert the option for Greylisting?
We're not a provider and we won't use a gateway.
We're want software for smart SMTP.
Tips like gateway or utilities from others is not the way for us. I think HMailServer is for companies like us a good alternative. Kind regards Rainer Noa  |
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| | | Forum Member
Group: Forum Members
Last Login: 2/22/2008 9:57:58 AM
Posts: 26, Visits: 38 |
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| | | Junior Member
Group: Forum Members
Last Login: 4/15/2008 5:23:04 PM
Posts: 24, Visits: 9 |
| | A few months ago I moved off of iMail and onto hMailServer and was so shocked by the reduction in spam that I constantly thought there was something wrong with my mail server. Not receiving 60+ spam e-mail every night takes some getting used to but I have learned to like it  It is clear to me that iMail will not be adding this feature even in the upcoming version (10). Seems that if I want my clients to also get used to not receiving spam - I will have to move them off iMail as well. Unfortunate, as I have been a customer for over 5 years. Happy Trails, Roderick... |
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| | | Forum Newbie
Group: Forum Members
Last Login: 3/13/2008 3:41:26 AM
Posts: 8, Visits: 16 |
| The only problem with hMailServer is that it does not handle multiple virtual IP-based domains very well.
iMail does that very well. In the logs, when an email is destined for an IP-based virtual domain, the SMTP forwarder uses that domain and IP throughout the logs, from start to finish. When sending out to the Internet, iMail (at least nowadays, it didn't used to) accurately uses the correct IP address and domain name as the source.
hMailServer documentation and help is not good enough to make clear how to duplicate this behavior, and indeed it does not seem possible to use it to do so.
If there are any more detailed docs out there than from their own web site on how to do this, then I would love to see them and would likely unreservedly switch to hMailServer. But we regularly support over 100 IP-based discrete domains on one instance of iMail and it works great, behaving like 100 different mail servers throughout. |
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| | | Forum Member
Group: Forum Members
Last Login: 4/22/2008 6:46:39 PM
Posts: 33, Visits: 37 |
| | I use a barracudda spam filter, it does the trick. Why does everyone threaten to drop imail, it works well when its setup correctly. |
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| | | Junior Member
Group: Forum Members
Last Login: 4/15/2008 5:23:04 PM
Posts: 24, Visits: 9 |
| | I moved a client from iMail to SmarterMail a week ago and now with only grey listing enabled users are getting about 5 spam messages a day - down from 40 when using StarEngine et al. I waited as long as I could for iMail to implement grey listing... was a customer for many years. |
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| | | Forum Member
Group: Forum Members
Last Login: 4/16/2008 8:01:11 AM
Posts: 26, Visits: 27 |
| | IMail spam controls are childs play--all I got to say is Postini, Postini, Postini, these guys are awesome, spam--what spam LOL, LOL |
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