Duplicate Emails on Forum Subscriptions

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5/25/2012 6:21:33 PM

itpurchasing

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Duplicate Emails on Forum Subscriptions

Hello!

I have a problem where one user on our site is receiving duplicate emails from the forum notifications. I can see in our mail server logs the duplicate emails are getting received from the mojoportal site bit the duplication is totally random. Some forum notifications will get duplicated and others will not.

She's not registered for a forum twice and there are no other accounts that share the same email address. I've sent her a test email from the site and it wasn't duplicated.

The strange thing is that is seems to only be this user that is having an issue.

Any help would be great

Thanks!

5/28/2012 12:11:08 PM

Joe Audette

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Re: Duplicate Emails on Forum Subscriptions

Hi,

I cannot consider this a bug unless steps are available to reproduce the problem. I'm certainly not seeing this problem on my site and it sends a lot of forum emails.

It is quite possible that she has 2 different email addresses and one of them forwards some messages to the other one making it seem like duplicates are being sent when they are not.

Hope that helps,

Joe

5/28/2012 1:09:33 PM

itpurchasing

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Re: Duplicate Emails on Forum Subscriptions

Yeah that's the strange thing. I'm seeing in the exchange logs the duplicate emails coming from the site itself. There doesn't seem to be any forwarding happening.

Defiantly a head scratcher

Thanks for the reply

5/30/2012 6:50:37 PM

itpurchasing

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Re: Duplicate Emails on Forum Subscriptions

Probably not posting this in the right forum but I think i may have found the reason it has been sending the user duplicates.

Found this in the site's System Log

2012-05-30 16:19:11,846 ERROR (null) - (null) - (null) - mojoPortal.Net.Email - error sending email to user@blah.com from "website" <websitemailer@web.com>, will retry
2012-05-30 16:19:12,034 INFO (null) - (null) - (null) - mojoPortal.Net.Email - success on retry 1 sending email to user@blah.com from "website" <websitemailer@web.com>

Looks like the site says that the email failed and then sends another one and gets a success. However, the failed email didn't fail and actually does get sent out.

Any ideas on why it might think it failed on the first attempt?

5/31/2012 1:29:16 AM

Crispin

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Re: Duplicate Emails on Forum Subscriptions

I've seen this problem too, if that's any help. I'll check the logs for the same pattern.

5/31/2012 8:41:26 AM

Joe Audette

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Re: Duplicate Emails on Forum Subscriptions

"2012-05-30 16:19:11,846 ERROR (null) - (null) - (null) - mojoPortal.Net.Email - error sending email to user@blah.com from "website" <websitemailer@web.com>, will retry"

Is that the full error message? Is there any detail or stack trace?

5/31/2012 12:07:45 PM

itpurchasing

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Re: Duplicate Emails on Forum Subscriptions

The only thing before the error is

2012-05-30 16:17:43,134 INFO (null) - (null) - (null) - mojoPortal.Business.WebHelpers.IndexWriterTask - Queued IndexWriterTask on a new thread
2012-05-30 16:18:35,402 INFO (null) - (null) - (null) - mojoPortal.Business.WebHelpers.IndexWriterTask - started IndexWriterTask task
2012-05-30 16:18:43,244 INFO (null) - (null) - (null) - mojoPortal.Web.WebTaskManager - started WebTaskManager task

And nothing afterwards.

Nothing seems to appear in the event viewer around this time tho so I can't get much deeper than just the messages. Also doesn't seem to be any errors in the exchange server logs

5/31/2012 12:23:04 PM

Joe Audette

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Re: Duplicate Emails on Forum Subscriptions

If it is actually resending the message it should also log something about success on retry x where x is the number of times it retried to send the message.

You can also disable the retry mechanism by adding this to user.config:

I've just now updated the code so it will log the error detail on smtp errors in the next release. Nothing will show up in Event Viewer because that only shows unhandled exceptions, this exception is a handled exception ie its in a try catch and the catch has retry logic.

Hope that helps,

Joe

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