Re: SMTP Virtual Server 'Quit' problem

I've got a Broadcom NetXtreme Gigabit Ethernet card. This is in an IBM x225
Dual Xeon box w/ 2gb ram. My only concern about turning esmtp off is that it
will bog down if someone tries to send an attachment over 10mb....with esmtp,
the connection is rejected before the transfer begins; without it, the
transmission isn't cut off until the 10mb limit is exceeded. Having said
that, I don't know how often that will be. I guess I'll need some assurance
that I won't see a performance hit.

As for Helo rather than Ehlo, doesn't the server revert back to helo if ehlo
isn't understood? What are the effects of using HELO only?

I'd be happy to try it. I just don't want to run into performance
issues....what say you?

Thanks again,

TBONE

"Tom Felts" wrote:

> Hmmm...what kind of NIC card(s) are in that box? I have seen some really
> strange issues with, for example, Intel chipset cards vanish with updated
> NIC drivers.
>
> Is ESMTP on? What happens if you trun it off? (Use helo rather than ehlo?)
>
>
>
> "TB0NE" <TB0NE@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:BABFFAFA-CA9D-40FD-8CCF-DF4A7A171C15@xxxxxxxxxxxxxxxx
> > Tom,
> >
> > The SMTP server is not performing a DNS Blacklist check of any kind. The
> > Spam filter does perform a DNS check but that is at the message level (not
> > protocol level) and it is performed only after the SMTP virtual server
> > accepts the message.
> >
> > I only get a single line stating 'Quit' for the dropped connection. Do you
> > know of any way to further analyze the logs. I don't have much to go on.
> >
> > Thanks,
> >
> > TBONE
> > "Tom Felts" wrote:
> >
> >> Are you doing any DNS blackholing., or does the SPAM filter you switched
> >> to
> >> do that?
> >>
> >> "TB0NE" <TB0NE@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> >> news:B7C42D3C-F06E-4672-86FB-DA70321D8F93@xxxxxxxxxxxxxxxx
> >> >I recently switched spam filters and have encountered a strange problem.
> >> >Let
> >> > me state right off that my problem is not related to the spam filter.
> >> >
> >> > The new filter does not have its own SMTP server and instead relies on
> >> > the
> >> > Virtual SMTP server within IIS. The application makes no changes to the
> >> > SMTP
> >> > server and simply applies rules to messages it receieves from the
> >> > virtual
> >> > server. I am running Windows 2000 SP4 and IIS 5 with all of the latest
> >> > updates.
> >> >
> >> > My problem is that for specific mail servers, the SMTP virtual server
> >> > simply
> >> > drops the connection. When I look at the logs, I don't even see an EHLO
> >> > or
> >> > HELO. There is simply a single line that states 'QUIT'
> >> >
> >> > 2005-04-08 18:49:13 168.215.79.61 SMTPSVC1 LIBERTY5 0 QUIT 240
> >> > or another server
> >> > 2005-04-08 20:50:25 24.172.50.194 SMTPSVC1 LIBERTY5 0 QUIT 240
> >> >
> >> > It doesn't even log the connecting mail servers name so it doesn't look
> >> > like
> >> > there's even an initial handshake.
> >> >
> >> > The problem is consistent with 5 other sending mail servers that I know
> >> > of.
> >> > There's probably more but I haven't found them yet. The problem does
> >> > not
> >> > seem
> >> > to be related to volume because there would be inconsistent mail
> >> > delivery.
> >> > That's not the case; if I receive messages from a certain domain I'll
> >> > always
> >> > get messages. If I can not get a message from another domain, I'll
> >> > never
> >> > receive their messages.
> >> >
> >> > I had a network admin at the sending site open a telnet session but he
> >> > wasn't able to get a response. He simply got a blinking cursor after
> >> > attempting the conneciton.
> >> >
> >> > I have no connection or relay restrictions set on the virtual server
> >> > and I
> >> > am allowiing anonymous access. My message size and session size are set
> >> > to
> >> > 10240K. The number of messages per connection is 20 and the number of
> >> > recipients per connection is 100. Finally, I am not limiting the number
> >> > of
> >> > incomming connections.
> >> >
> >> > Any and all ideas and suggestions are welcome.
> >> >
> >> > Thank you,
> >> > --
> >> > TB0NE
> >>
> >>
> >>
>
>
>
.

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