IOS/Xcode error when using System.net.mail

Hey all, I've stumbled upon an issue with sending smtp mail via my apps. The Android and desktop versions work fine however IOS does not. It also doesn't crash, it simply does nothing. So I debugged it in Xcode and found it outputting the following error report. I have no idea why this is and what it means.
Has anyone else encountered anything like this and know what may be causing it? Any help/ advice would be a huge help as I really don't know what to do next. I can provide more information if required. Thanks in advance

(Filename: /Users/builduser/buildslave/unity/build/artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 65)


MissingMethodException: Method not found: 'Default constructor not found...ctor() of System.Net.Configuration.MailSettingsSectionGroup'.

at Mono.Security.Uri.HexEscape (Char character) [0x00000] in <filename unknown>:0

at System.Activator.CreateInstance (System.Type type, Boolean nonPublic) [0x00000] in <filename unknown>:0

at System.Configuration.ConfigInfo.CreateInstance () [0x00000] in <filename unknown>:0

at iTween.easeInOutElastic (Single start, Single end, Single value) [0x00000] in <filename unknown>:0

at System.Configuration.Configuration.GetSectionGroupInstance (System.Configuration.SectionGroupInfo group) [0x00000] in <filename unknown>:0

at System.Configuration.ConfigurationSectionGroupCollection.get_Item (System.String name) [0x00000] in <filename unknown>:0

at System.Configuration.Configuration.GetSection (System.String path) [0x00000] in <filename unknown>:0

at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection (System.String configKey) [0x00000] in <filename unknown>:0

at System.MonoInternalNoteAttribute..ctor (System.String comment) [0x00000] in <filename unknown>:0

at System.Configuration.ConfigurationManager.GetSection (System.String sectionName) [0x00000] in <filename unknown>:0

at System.Net.Mail.SmtpClient..ctor (System.String host, Int32 port) [0x00000] in <filename unknown>:0

at System.Net.Mail.SmtpClient..ctor (System.String host) [0x00000] in <filename unknown>:0

at mono_gmail.SendCableDesignMail (System.String email, System.String cableLength, System.String colorCode) [0x00000] in <filename unknown>:0

at PostSubmissionData+<TrySubmitCableDelayed>c__Iterator0.MoveNext () [0x00000] in <filename unknown>:0

at System.Collections.Generic.Dictionary`2+Transform`1[System.Int32,UnityEngine.EventSystems.PointerEventData,System.Collections.Generic.KeyValuePair`2[System.Int32,UnityEngine.EventSystems.PointerEventData]].EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0

System.Collections.Generic.Transform`1:EndInvoke(IAsyncResult)


(Filename: currently not available on il2cpp Line: -1)

 

I get the same error when trying to send an email from iOS(works great on Android and Unity Editor).

I tried Josh's solution but it's not working. Have you solved this problems somehow? Thanks!

 

Quick addition for devs getting here via search: In newer versions of Unity you have to add an additional line to link.xml:

 

I also need to add the namespace to my c# script

Code (CSharp):

1. using System.Net.Configuration

 

You guys in this thread are the best. <3


Just incase anyone else comes here, when I pasted this additional line into xcode it gave me a weird character, which when I built meant the fix didn't work, you have to select the character and delete that and nothing else, then the fix will work.

Thanks for all the info guys, I'm gonna look into stripping now (engine stripping that is...) godspeed to all of you!

Tom

 

[QUOTE = "JoshPeterson, publicación: 2389645, miembro: 660077"] [USER = 748491] @danieltranca [/ USER]

Es posible que esté experimentando este error:

http://issuetracker.unity3d.com/issues/il2cpp-crashes-when-using-smtpclient

Tenga en cuenta que tenemos un trabajo más complejo que el que sugerí anteriormente en este hilo. Puedes usar este archivo link.xml:

<linker>
<assembly fullname = "Sistema">
<type fullname = "System.Net.Configuration.MailSettingsSectionGroup" preserve = "all" />
<type fullname = "System.Net.Configuration.SmtpSection" preserve = "all" />
<type fullname = "System.Net.Configuration.SmtpNetworkElement" preserve = "all" />
</ assembly>
</ linker>

Una vez que corrijamos este problema, no necesitará este archivo link.xml, pero aún no hemos podido completar la corrección. [/ QUOTE]

 

Greetings. I have the problem of not being able to send email on the iOS platform, I see that in this thread you comment that creating a link.xml with the references that you indicate is solved, I have created the file and I have placed it in the asset folder but I compile the project and still not send, I have to save it in another folder? or select some spices configuration so that link.xml does its function ?, thanks.

 

same issue here, didn't see it at first since xcode wasn't showing the symbol.

 

It's working when stripping set only to low, which makes the size of the app ridiculously large. When setting stripping to higher level, the mail does not send, there are no errors, and the success callback is sent, but nothing arrives in the mail. Is there a way to investigate this issue?