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Home > Archive > IIS and SMTP > August 2006 > IIS6 SMTP Server
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| pblse2 2006-06-19, 3:05 pm |
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jakeyy wrote:
> Have a strange issue with IIS6 SMTP server, mail just sits in the queue.
> After a server reboot mail is forwared, but all new mail still sits in the
> queue. The logs say the remote domain can't be found and sent mail is
> delayed.
>....
Are they really stuck or just queued because they have been delayed ? A
lot of stupid servers today use something called greylisting which
assumes that a spammer won't try and send an email twice so they reject
all emails once and expect legitimate servers to resend it.
That could be one reason your queue is getting full, check into your
resend intervals and when delay messages should be sent out (usually
not on first retry).
If it says the remote domain couldnt be found it's either invalid or
you have a DNS issue on your machine, pherhaps the DNS server is
unavailable at times, do you have a backup listed (ipconfig /all) ?
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| jakeyy 2006-06-19, 3:35 pm |
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"pblse2" wrote:
>
> jakeyy wrote:
>
> Are they really stuck or just queued because they have been delayed ? A
> lot of stupid servers today use something called greylisting which
> assumes that a spammer won't try and send an email twice so they reject
> all emails once and expect legitimate servers to resend it.
>
> That could be one reason your queue is getting full, check into your
> resend intervals and when delay messages should be sent out (usually
> not on first retry).
>
> If it says the remote domain couldnt be found it's either invalid or
> you have a DNS issue on your machine, pherhaps the DNS server is
> unavailable at times, do you have a backup listed (ipconfig /all) ?
>
>
Hi pblse2
All email goes to one email address to our email server, so I doubt this is
due to anti spam or retry intervals. There are two dns servers that we
monitor and always are up I even tried manually doing lookups just to make
sure it's not DNS.
All was fine, this just started happening. First all email was forwarding
to the badmail folder, after a couple of reboots it started to get stuck in
both badmail and queue(it's not delayed it gets permanently stuck until I
look and delete it manually). Just rebooted the server again, and all email
is going trough ok for now, pretty sure it's going to get stuck in the queue
shortly. Only a small amount of emails are actually relayed trough IIS
smtp to our exchange account daily and the system is not overloaded.
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| jakeyy 2006-06-19, 7:22 pm |
| Have a strange issue with IIS6 SMTP server, mail just sits in the queue.
After a server reboot mail is forwared, but all new mail still sits in the
queue. The logs say the remote domain can't be found and sent mail is
delayed.
Other times mail goes into the Badmail folder and I know those emails have
valid from and to addresses. All mail is being sent trough our website on
same server using cdonts. After server is rebooted all seems ok for few hours
or/and all old mail is being sent from the queue and new email gets stuck in
the queue again?
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| pblse2 2006-06-19, 7:22 pm |
|
jakeyy wrote:
> Have a strange issue with IIS6 SMTP server, mail just sits in the queue.
> After a server reboot mail is forwared, but all new mail still sits in the
> queue. The logs say the remote domain can't be found and sent mail is
> delayed.
>....
Are they really stuck or just queued because they have been delayed ? A
lot of stupid servers today use something called greylisting which
assumes that a spammer won't try and send an email twice so they reject
all emails once and expect legitimate servers to resend it.
That could be one reason your queue is getting full, check into your
resend intervals and when delay messages should be sent out (usually
not on first retry).
If it says the remote domain couldnt be found it's either invalid or
you have a DNS issue on your machine, pherhaps the DNS server is
unavailable at times, do you have a backup listed (ipconfig /all) ?
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| jakeyy 2006-06-19, 7:22 pm |
|
"pblse2" wrote:
>
> jakeyy wrote:
>
> Are they really stuck or just queued because they have been delayed ? A
> lot of stupid servers today use something called greylisting which
> assumes that a spammer won't try and send an email twice so they reject
> all emails once and expect legitimate servers to resend it.
>
> That could be one reason your queue is getting full, check into your
> resend intervals and when delay messages should be sent out (usually
> not on first retry).
>
> If it says the remote domain couldnt be found it's either invalid or
> you have a DNS issue on your machine, pherhaps the DNS server is
> unavailable at times, do you have a backup listed (ipconfig /all) ?
>
>
Hi pblse2
All email goes to one email address to our email server, so I doubt this is
due to anti spam or retry intervals. There are two dns servers that we
monitor and always are up I even tried manually doing lookups just to make
sure it's not DNS.
All was fine, this just started happening. First all email was forwarding
to the badmail folder, after a couple of reboots it started to get stuck in
both badmail and queue(it's not delayed it gets permanently stuck until I
look and delete it manually). Just rebooted the server again, and all email
is going trough ok for now, pretty sure it's going to get stuck in the queue
shortly. Only a small amount of emails are actually relayed trough IIS
smtp to our exchange account daily and the system is not overloaded.
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| pblse2 2006-06-20, 1:18 am |
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Well, I don't know, seems a lot of people are having issues right now,
maybe somekind of attack.
Check your eventlog to see if you can find any errors or warnings that
might be related and change your smtp service logging so it logs as
much as possible.
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| pblse2 2006-06-20, 1:36 am |
|
Well, I don't know, seems a lot of people are having issues right now,
maybe somekind of attack.
Check your eventlog to see if you can find any errors or warnings that
might be related and change your smtp service logging so it logs as
much as possible.
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| Dave C 2006-06-23, 7:39 am |
| Hi Jakeyy,
I have the exact same thing going on here! At about 12:30PM EST, messages
just hang in the queue folder and are not delivered to the next hop.
Rebooting the server frees up the messages for delivery for a short time, but
will eventually freeze again. I've tried to send messages using telnet from
this IIS server to my next hop and even THESE freeze! When I break the
telnet session, the message gets delivered (should not happen like this!) If
I look at my next hop (Exchange 2003), I see SMTP cennections established,
but no transfer of messages occur. I've turned up logging on both IIS and
Exchange servers and nothing appears in the event viewer. Occaisonally I get
a semaphore timeout or connection dropped by remote server (wouold expect
that after reaching timeout interval). Just like you, this JUST started
happening about 3 days ago.
I have a call into Microsoft. If anything comes out of that call, I'll let
you know!
"jakeyy" wrote:
> Have a strange issue with IIS6 SMTP server, mail just sits in the queue.
> After a server reboot mail is forwared, but all new mail still sits in the
> queue. The logs say the remote domain can't be found and sent mail is
> delayed.
> Other times mail goes into the Badmail folder and I know those emails have
> valid from and to addresses. All mail is being sent trough our website on
> same server using cdonts. After server is rebooted all seems ok for few hours
> or/and all old mail is being sent from the queue and new email gets stuck in
> the queue again?
>
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| Dave C 2006-06-23, 1:21 pm |
| Hi Jakeyy,
I have the exact same thing going on here! At about 12:30PM EST, messages
just hang in the queue folder and are not delivered to the next hop.
Rebooting the server frees up the messages for delivery for a short time, but
will eventually freeze again. I've tried to send messages using telnet from
this IIS server to my next hop and even THESE freeze! When I break the
telnet session, the message gets delivered (should not happen like this!) If
I look at my next hop (Exchange 2003), I see SMTP cennections established,
but no transfer of messages occur. I've turned up logging on both IIS and
Exchange servers and nothing appears in the event viewer. Occaisonally I get
a semaphore timeout or connection dropped by remote server (wouold expect
that after reaching timeout interval). Just like you, this JUST started
happening about 3 days ago.
I have a call into Microsoft. If anything comes out of that call, I'll let
you know!
"jakeyy" wrote:
> Have a strange issue with IIS6 SMTP server, mail just sits in the queue.
> After a server reboot mail is forwared, but all new mail still sits in the
> queue. The logs say the remote domain can't be found and sent mail is
> delayed.
> Other times mail goes into the Badmail folder and I know those emails have
> valid from and to addresses. All mail is being sent trough our website on
> same server using cdonts. After server is rebooted all seems ok for few hours
> or/and all old mail is being sent from the queue and new email gets stuck in
> the queue again?
>
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| Dave C 2006-08-07, 7:21 pm |
| Hi Jakeyy,
Sorry for the delay in posting this...
What we found out is that Symantec Anti-Virus (version 9) was scanning the
message transport. What had happened was Symantec was configured incorrectly
and had a setting called "Internet Message Scanning" enabled. This setting
is for a desktop client and should not be used on a server. After
reconfiguring the Symantec AV client, my problem went away.
Hope this helps you!
"Dave C" wrote:
[vbcol=seagreen]
> Hi Jakeyy,
>
> I have the exact same thing going on here! At about 12:30PM EST, messages
> just hang in the queue folder and are not delivered to the next hop.
> Rebooting the server frees up the messages for delivery for a short time, but
> will eventually freeze again. I've tried to send messages using telnet from
> this IIS server to my next hop and even THESE freeze! When I break the
> telnet session, the message gets delivered (should not happen like this!) If
> I look at my next hop (Exchange 2003), I see SMTP cennections established,
> but no transfer of messages occur. I've turned up logging on both IIS and
> Exchange servers and nothing appears in the event viewer. Occaisonally I get
> a semaphore timeout or connection dropped by remote server (wouold expect
> that after reaching timeout interval). Just like you, this JUST started
> happening about 3 days ago.
>
> I have a call into Microsoft. If anything comes out of that call, I'll let
> you know!
>
> "jakeyy" wrote:
>
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