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Error:  "Too many messages for this session" when sending email

Posted on 2009-02-18
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I am running Exchange 2003 SP2 on WK23.  I have a small service that sends emails to about 700 phones (not spam) and get received as text messages.  I have started to monitor eventviewer and have noticed many of these errors:

This is an SMTP protocol warning log for virtual server ID 1, connection #16. The remote host "165.27.250.2", responded to the SMTP command "mail" with "421 #4.x.2 Too many messages for this session  ". The full command sent was "MAIL FROM:<info@mydomain.com> SIZE=700  ".  This may cause the connection to fail.

Any ideas what this means or how to fix it?
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Question by:MFredin
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by:Mestha
ID: 23673699
While you might not consider it to be spam, the service provider's systems will be seeing it as bulk messages.
They would prefer that you pay to send those messages through their services - the USA is unique in being able to send text messages for free, everywhere else it is a valuable source of revenue for the mobile phone company.

You will need to use a bulk email too to restrict the amount of messages sent in a session to the host. Exchange isn't able to do that.

-M
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Author Comment

by:MFredin
ID: 23673830
Darn.  The text messages are time sensitive so it makes it tough if I have to send some first and some later.  Any ideas on how to get around this without paying a fortune?  What if I setup a couple domains and IP's to send from and split the messages between the 2. Would that work?
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by:Mestha
ID: 23675704
That may work, but it depends on how good the mobile phone company are at detecting the messages. They have commercial reasons for wanting to block the bulk messages, not just spam. Once the USA catches up with the rest of the world with their mobile phone technology the SMTP to text message gateways will go away and it will become the same type of revenue earner that it is in Europe and elsewhere.

-M
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by:MFredin
ID: 23691843
Well thats not going to be fun because text messaging gateways charge an arm and a leg to send a text.  You have any guestimates on when these changes could be taking place?
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by:Mestha
ID: 23692837
No idea. I am in the UK and it has been a fact of life for us for at least five years. The US phone market is very immature compared to Europe, probably three or four years behind. Email to text gateways simply do not exist over here, but that also means that there is no spam on phones.

-M
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Mestha earned 2000 total points
ID: 23692861
Or let me put it another way, if you have a business model that uses SMTP to text as a way of working, which does not take in to account the cost of sending the texts through a gateway, then you probably need to start planning on how to adjust it.

We don't have any of the nice Google based services in the UK that use text services because the cost is too high.

-M
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