Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

ISA 2006 publishing Exchange

Posted on 2008-06-16
11
Medium Priority
?
458 Views
Last Modified: 2008-11-17
If I have an Exchange server and it is temporarily down, any SMTP server trying to send mail to it will not be able to connect and will hence do retries. What will happen if I publish this Exchange server through an ISA and the Exchange is taken down for maintenance? Will ISA inform the SMTP servers trying to send mail to the Exchange server that it is down so they will retry?
0
Comment
Question by:peakpeak
  • 6
  • 4
11 Comments
 
LVL 6

Expert Comment

by:Nyah247
ID: 21794011
I don't believe ISA will actually "inform" the servers attempting to connect.  The SMTP connection will just simply fail and the connecting servers will re-attempt according to their configuration.
0
 
LVL 28

Author Comment

by:peakpeak
ID: 21794879
Ok, what I'm aiming at is that no mail will be lost if the Exchange server is down but ISA is handling the connection. Your reasoning is in line with mine but I'd like a more precise answer.
0
 
LVL 6

Expert Comment

by:Nyah247
ID: 21794942
Mail will be eventually lost if Exchange is down for a prolonged period of time.  ISA does receive and hold the email until Exchange is back online.  

Typically connecting mail servers will send a delay message to the sender then re-attempt a connection after a set time.  If it still cannot connect after the configured time (usually 24-48 hrs) the sending server will discard the message and send an NDR.
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 28

Author Comment

by:peakpeak
ID: 21794983
You mean that the ISA has a mail queue? I don't believe that
0
 
LVL 6

Expert Comment

by:Nyah247
ID: 21794991
If you want true failover you will have to setup an additional mail server then configure multiple MX records with different priorities.
0
 
LVL 6

Expert Comment

by:Nyah247
ID: 21795017
No...ISA doesn't have a queue.
0
 
LVL 28

Author Comment

by:peakpeak
ID: 21795034
How can it then "hold the mail" as you stated?
0
 
LVL 6

Expert Comment

by:Nyah247
ID: 21795037
That was a typo...sorry.  
0
 
LVL 6

Expert Comment

by:Nyah247
ID: 21795054
It cannot hold the mail...  You are "dead in the water" if Exchange is down.
0
 
LVL 28

Accepted Solution

by:
peakpeak earned 0 total points
ID: 21795060
I'm pretty good at mail server communication, just unsure how the ISA will react in a scenario I've described above
0
 
LVL 51

Expert Comment

by:Keith Alabaster
ID: 21897857
Hey Peter, have got your mail but have only just returned (today) from holiday after a few weeks in sunny Mexico. Didn't ignore you :).

Regards

Keith
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

ISA Server detected routes through the network adapter LAN that do not correlate with the network to which this network adapter belongs What does this mean and how can one go about correcting it? In simple terms, this error message indicates t…
In Africa (and potentially where you live…), reliability of ISPs is questionable.  With the increased reliance on e-mail as one of the primary forms of communication, the costs to business are significant based on interuption of ISP Connectivity.  T…
In a question here at Experts Exchange (https://www.experts-exchange.com/questions/29062564/Adobe-acrobat-reader-DC.html), a member asked how to create a signature in Adobe Acrobat Reader DC (the free Reader product, not the paid, full Acrobat produ…
Look below the covers at a subform control , and the form that is inside it. Explore properties and see how easy it is to aggregate, get statistics, and synchronize results for your data. A Microsoft Access subform is used to show relevant calcul…

877 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question