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Email SMTP connection and recipient limit

Posted on 2013-01-06
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Last Modified: 2013-01-06
Hi,

What is the best email limit for:

1. Internal Exchange server - emails per SMTP connection
2. Internal Exchange server - recipient per SMTP email
3. Internal Exchange server - recipient per email within Exchange
4. F/E Exchange server - emails per SMTP connection
5. F/E Exchange server - recipient per SMTP email

Thanks
 DL
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Question by:panda5888
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LVL 52

Expert Comment

by:Manpreet SIngh Khatra
ID: 38749525
How BIG is your environment ? (Users)
What is user usage per day and email Transactions ?
What is the capacity of the HUB servers ?

My Recommendation would be
1. 10 MB (Can be some exceptional users)
2. 200 or depends on the DL sizes and restrictions on them
3. Same as above
4. External email for Sending 15-20MB at Max and Receiving could be 20-25MB (cause Email expands by 30-35%)

- Rancy
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Author Comment

by:panda5888
ID: 38749537
Example about 1000 users.


What is the best email limit for:

1. Internal Exchange server - emails per SMTP connection (1000 emails?)
2. Internal Exchange server - recipient per SMTP email (200 recipients?)
3. Internal Exchange server - recipient per email within Exchange (200 recipients?)
4. F/E Exchange server - emails per SMTP connection (1000 emails?)
5. F/E Exchange server - recipient per SMTP email (200 recipient)

I have already dicided in terms of MB .... what I like to know is those above.
thanks.
DL
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Author Comment

by:panda5888
ID: 38749556
by the way ..this is Exchange 2003, uses Exchange F/E ... so there is no CAS.
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LVL 52

Expert Comment

by:Manpreet SIngh Khatra
ID: 38749563
I guess by "emails per SMTP connection" you mean how many users can be send an email in one shot .... Right

Look ideally if its that than i wouldnt have the limit too HIGH as i dont want a normal user to send email to 1000 people and then some of those Idiots "Reply To All" .... will affect the server very badly

- Rancy
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Author Comment

by:panda5888
ID: 38749573
"emails per SMTP connection" ..  can be from an mobile Outlook user connected to the Exchange F/E, so at one shot how many emails should we allow this to send per SMTP connection, as there is a setting in Exchange 2003 to limit that.... should it be 20? 50? 100? 1000? 10000?

"emails per SMTP connection"  internally could be from say a monitoring system, database system, application and LAN Outlook users. ....
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LVL 52

Expert Comment

by:Manpreet SIngh Khatra
ID: 38749594
I would limit all close or below 200 as i dont want to many emails to be shot every-time .... I would tell you a real case wherein someone did send Recognition email to a DL that was for a Site\Location having 1680 people and local IT didnt have that set to restrictions for any user and "Single connection" was set to 2000 ...... some folks then started replying saying "Please Exclude and dont SPAM" same happened over 600+ emails and servers were hung for some time

- Rancy
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Author Comment

by:panda5888
ID: 38749622
what about max recipient per SMTP email? what did u set?
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Accepted Solution

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Manpreet SIngh Khatra earned 180 total points
ID: 38749638
We have it set to 200 and mostly are DL's and we have Fortimail in which we check no user is sending huge number of emails on a week basis just to keep a track and if so try to contact and understand their requirements and try to keep safeguard

- Rancy
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Author Closing Comment

by:panda5888
ID: 38749923
thank you for the input
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LVL 52

Expert Comment

by:Manpreet SIngh Khatra
ID: 38749927
Panda hope you wont mind me asking you the reason for "C" grade

- Rancy
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