Solved

ISA 2006 publishing Exchange

Posted on 2008-06-16
11
433 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 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
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.

 
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

There are three types of ISA client that can be configured - these can be individual clients or multiples of a client on each PC or server SecureNAT. A SecureNAT client for ISA server is a client machine, work station or server, that has its defa…
So the following errors occurs in 2 ways that I am aware of at this stage, and you receive one of the following error messages: ERROR 1. When trying to save a rule: No Web listener is specified for the Web publishing rule Autodiscovery Publishin…
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …

628 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