Error on opening email with error maxJsonLength exceeded

Problem reported by C.L. Lee - 4/17/2018 at 4:03 AM

Submitted

Our client getting the error on webmail when trying to check out an email.

From the error log it's stated below:

System.InvalidOperationException: Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property

Have tried to increase the maxJsonLength value in web.config but can't seems to work,

any recommend resolution?

8 Replies

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secretwep Replied

12/17/2018 at 11:15 AM

I came across this same issue today. I also increased maxJsonLength in web.config to no avail. It's only on one email and I've never encountered it before on any SM version over the past 7-8 years.

-John

Jack. Replied

12/17/2018 at 12:13 PM

You can set the MaxJsonLength property on your web.config:

<configuration>
<system.web.extensions>
<scripting>
<webServices>
<jsonSerialization maxJsonLength="50000000"/>
</webServices>
</scripting>
</system.web.extensions>
</configuration>

secretwep Replied

12/17/2018 at 3:21 PM

That is indeed how it is set. Both CL Lee and I did this, as alluded to in the posts.

My solution: I had the client have his client re-send the email. It had an attachment, so I told him to have it resent zipped up. Since this has only happened once in nearly a decade, I'm not too concerned anymore.

Employee Replied

12/17/2018 at 4:51 PM

Employee Post

Thanks for your update, secretwep.

C.L Lee, please also note that you'll need to stop the SmarterMail Service before modifying system files.

CLEBER SAAD Replied

6/3/2021 at 7:07 AM

We received on email with 10mb of attachents.

I tried to do this in the web.config, restarted the IIS and MailServer and the problem continues.

Using version 15.7.6726

Any tips?

Kyle Kerst Replied

6/3/2021 at 7:19 AM

Employee Post

@Cleber I believe you'll need your own thread on this one, as this post refers to later releases, and your issue looks to be related to maximum message size rather than a JSON problem.

Kyle Kerst Lead Internal Network/System Administrator SmarterTools Inc. smartertools.com

CLEBER SAAD Replied

6/3/2021 at 8:46 AM

Hello @Kyle. I will open a support ticket with more information. I assigned with that thread because the message error its the same. Another messages with attachs with same or higer size works fine. It's for a particular message.

Kyle Kerst Replied

6/3/2021 at 8:48 AM

Employee Post

Thanks Cleber, that sounds like a great plan. We'll get to the bottom of it for you!

Kyle Kerst Lead Internal Network/System Administrator SmarterTools Inc. smartertools.com

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