Comments on: BDAT causing SMTP service to drop Email http://joekiller.com/2007/09/19/bdat-causing-smtp-service-to-drop-email/ Music.Life.Tech.Charlottesville Wed, 12 Aug 2009 14:16:11 -0400 http://wordpress.org/?v=2.9.2 hourly 1 By: Joe http://joekiller.com/2007/09/19/bdat-causing-smtp-service-to-drop-email/comment-page-1/#comment-3697 Joe Wed, 12 Aug 2009 14:16:11 +0000 http://joekiller.com/?p=96#comment-3697 Hi Alan, I think you will be safe to subtract out the offending SMTP verbs from the total options. The KB article only focuses on a limited subset of the SMTP commands that IIS' SMTP service offers. In any case, since they are tied to specific hex values, subtracting out the ones you want to turn off will turn those off. I would suggest writing down the original just in case things don't go as planned. We dumped the product after we fixed this problem due to the slowdown it caused in the mail queue. Good luck! -Joe Hi Alan,

I think you will be safe to subtract out the offending SMTP verbs from the total options. The KB article only focuses on a limited subset of the SMTP commands that IIS’ SMTP service offers. In any case, since they are tied to specific hex values, subtracting out the ones you want to turn off will turn those off. I would suggest writing down the original just in case things don’t go as planned. We dumped the product after we fixed this problem due to the slowdown it caused in the mail queue.

Good luck!

-Joe

]]> By: Alan http://joekiller.com/2007/09/19/bdat-causing-smtp-service-to-drop-email/comment-page-1/#comment-3695 Alan Tue, 11 Aug 2009 22:05:46 +0000 http://joekiller.com/?p=96#comment-3695 I'm having a similar problem, and I found the Symantec SMTP Server with the Metabase Explorer. However, the current value for SmtpInboundCommandSupportOptions is 4546589 and from the MS artile you mention I cannot figure what combination of options is turned on or off from this value. Should I simply subtract the values for Binary and Chunking from this and hope? I’m having a similar problem, and I found the Symantec SMTP Server with the Metabase Explorer. However, the current value for SmtpInboundCommandSupportOptions is 4546589 and from the MS artile you mention I cannot figure what combination of options is turned on or off from this value. Should I simply subtract the values for Binary and Chunking from this and hope?

]]> By: Magnus Hasselgård http://joekiller.com/2007/09/19/bdat-causing-smtp-service-to-drop-email/comment-page-1/#comment-3206 Magnus Hasselgård Thu, 18 Sep 2008 15:26:19 +0000 http://joekiller.com/?p=96#comment-3206 Excellent! I was troubleshooting a problem similar to this one back in 2005, but from a client-side perspective. The SMTPSVC running on Windows 2000 Server was getting the exact same treatment when forwarding mails with BDAT to an Exchange 5.0 server. I never did figure out why BDAT had stopped working, but I found a workaround that forced the SMTPSVC service to always use DATA instead: change the MetaBase property /LM/SmtpSvc/SmtpOutboundCommandOptions from "7" (the default) to "5". Undocumented, but worked like a charm. :) The problem resurfaced at a different installation this week, with Windows 2003 Server and Exhange 6. Now I can tell the Exhange administrators there to take a closer look at their security software - _it_ could actually be dropping BDAT connections, like you describe. Thanks! -m- Excellent!

I was troubleshooting a problem similar to this one back in 2005, but from a client-side perspective. The SMTPSVC running on Windows 2000 Server was getting the exact same treatment when forwarding mails with BDAT to an Exchange 5.0 server. I never did figure out why BDAT had stopped working, but I found a workaround that forced the SMTPSVC service to always use DATA instead: change the MetaBase property /LM/SmtpSvc/SmtpOutboundCommandOptions from “7″ (the default) to “5″. Undocumented, but worked like a charm. :)

The problem resurfaced at a different installation this week, with Windows 2003 Server and Exhange 6. Now I can tell the Exhange administrators there to take a closer look at their security software – _it_ could actually be dropping BDAT connections, like you describe.

Thanks!

-m-

]]> By: Duane Gran http://joekiller.com/2007/09/19/bdat-causing-smtp-service-to-drop-email/comment-page-1/#comment-2291 Duane Gran Thu, 20 Sep 2007 19:13:58 +0000 http://joekiller.com/?p=96#comment-2291 This is somewhat prophetic, as I am troubleshooting an issue with our Exchange mail server that seems very similar to this. Thank you for offering up the notes on your experiences. This is somewhat prophetic, as I am troubleshooting an issue with our Exchange mail server that seems very similar to this. Thank you for offering up the notes on your experiences.

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