SMTP connection limit

We send out a blast of 200+ emails every so often and always get back delayed or about 30 bounceback emails from internal and external emails. If we resend the ones that NDR it will go through. Is there a max per email connection limit? Is there a throttling limit?
CiscoAznAsked:
Who is Participating?
 
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Sorry but this isnt any issues with your server ..... its either the Exchange cannot deliver to the Smarthost which according to me is more unlikely or send to recipient Server

RETRIES EXHAUSTED WHILE ATTEMPTING TO CONNECT TO REMOTE HOST

- Rancy
0
 
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Is that a DL you send email or add 200+ users manually ?
Is there some attachments ?
Check what is the recipient limit per email set on the Connectors and Global .... do you have any Firewall or Router if so what is the value there ?

- Rancy
0
 
netballiCommented:
You need to check with your ISP as they would have set a limit on SMTP Sending Limit and Email Rate Limits.
0
Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

 
CiscoAznAuthor Commented:
It is not a DL but sent through the AS400 using the Exchange Relays. It is sent individually by the system and it does send w/PDF attachment. We recently changed the AS400 to point the relays to our Exchange 2010 so before it didn't have this problem. There shouldn't be router/firewall problem since it goes through but just a small percentage gets NDR and is successful when resent manually.
0
 
CiscoAznAuthor Commented:
It is not an ISP problem it recently occurred when we switched our AS400 pointing from Exchange 2003 to the Exchange 2010 to relay emails.
0
 
Simon Butler (Sembee)ConsultantCommented:
For 200 users I would just outsource it. That number of users can be outsourced for free and you then don't have to worry about Exchange and its poor bulk emailing performance.

Simon.
0
 
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Can there be 2 or more batches created to send that emails ?
What is the NDR you get ?

- Rancy
0
 
CiscoAznAuthor Commented:
Here is the NDR received. We didn't have a problem before w/Exchange 2003.

YOUR MESSAGE
COULD NOT BE DELIVERED TO
<"users email.com">     RETRIES EXHAUSTED WHILE ATTEMPTING TO CONNECT TO REMOTE HOST
0
 
vSolutionsITCommented:
Those emails which bounce back, are they belong to same domain or different domains?
0
 
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
RETRIES EXHAUSTED WHILE ATTEMPTING TO CONNECT TO REMOTE HOST - The error seems to be with the Recipient server i guess or is it on the Application server ?

Can you verify the email address as just want to make sure its correct format as what i see in the error i dont see @ sign ?

- Rancy
0
 
CiscoAznAuthor Commented:
The NDR is from different email addresses "@yahoo, @gmail, @msn, and our internal users @domain.com".
0
 
Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
It doesnt seems a Exchange NDR more of the App itself.
Were there any other changes made to the App and any events on the App server ?

YOUR MESSAGE
COULD NOT BE DELIVERED TO
<"users email.com">     RETRIES EXHAUSTED WHILE ATTEMPTING TO CONNECT TO REMOTE HOST

- Rancy
0
 
Exchange_GeekCommented:
If the issue started only after you switched from Exchange 2003 to 2010, then this is purely being affected cause of default limits.

Run Get-TransportConfig to view Org-wide default limits and provide feedback.

Also, does Exchange send out emails using DNS or you got a smart host configured in Send Connector?

Regards,
Exchange_Geek
0
 
CiscoAznAuthor Commented:
Sorry for the delayed response but we do use a smarthost. i ran the command and it doesn't show limit amount.
0
 
CiscoAznAuthor Commented:
Sorry for the delayed response but it seems to be resolved now.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.