Error while sending Email in Unity iOS App

Hi there,

Please help, I've tried a couple of different options to send an email through the iOS build, but nothing works for me. I can run it in the Unity Editor and the Email works, but not on the mobile app.

Unity: 2017.3f
iOS: 11.2.2
XCode: 9.2
Unity API Level: .NET 2.0 and I tried .NET 2.0 Subset

I have added the link.xml into the Assets folder.
link.xml:
<linker>
<assembly fullname="System">
<type fullname="System.Net.Configuration.MailSettingsSectionGroup" preserve="all"/>
<type fullname="System.Net.Configuration.SmtpSection" preserve="all"/>
<type fullname="System.Net.Configuration.SmtpNetworkElement" preserve="all"/>
<type fullname="System.Net.Configuration.SmtpSpecifiedPickupDirect‌oryElement" preserve="all"/>
</assembly>
</linker>

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

at System.Activator.CreateInstance (System.Type type, System.Object[] args) [0x00000] in <filename unknown>:0
at System.Configuration.PropertyInformation.get_Value () [0x00000] in <filename unknown>:0
at System.Configuration.PropertyInformation.Reset (System.Configuration.PropertyInformation parentProperty) [0x00000] in <filename unknown>:0
at System.Configuration.ElementInformation.Reset (System.Configuration.ElementInformation parentInfo) [0x00000] in <filename unknown>:0
at System.Configuration.Configuration.GetSectionInstance (System.Configuration.SectionInfo config, Boolean createDefaultInstance) [0x00000] in <filename unknown>:0
at System.Configuration.Configuration.GetSectionInstance (System.Configuration.SectionInfo config, Boolean createDefaultInstance) [0x00000] in <filename unknown>:0
at System.Configuration.Configuration.GetSectionInstance (System.Configuration.SectionInfo config, Boolean createDefaultInstance) [0x00000] in <filename unknown>:0
at System.Configuration.ConfigurationSectionCollection.get_Item (System.String name) [0x00000] in <filename unknown>:0
at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection (System.String configKey) [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 EmailController.SendEmail () [0x00000] in <filename unknown>:0
at UnityEngine.Events.UnityEvent.Invoke () [0x00000] in <filename unknown>:0
at UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.EventFunction`1 functor) [0x00000] in <filename unknown>:0
at UnityEngine.EventSystems.StandaloneInputModule.ProcessTouchPress (UnityEngine.EventSystems.PointerEventData pointerEvent, Boolean pressed, Boolean released) [0x00000] in <filename unknown>:0
at UnityEngine.EventSystems.StandaloneInputModule.ProcessTouchEvents () [0x00000] in <filename unknown>:0
at UnityEngine.EventSystems.StandaloneInputModule.Process () [0x00000] in <filename unknown>:0
UnityEngine.EventSystems.ExecuteEvents:Execute(GameObject, BaseEventData, EventFunction`1)
UnityEngine.EventSystems.StandaloneInputModule: ProcessTouchPress(PointerEventData, Boolean, Boolean)
UnityEngine.EventSystems.StandaloneInputModule: ProcessTouchEvents()
UnityEngine.EventSystems.StandaloneInputModule: Process()

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

 

When I compare your "SmtpSpecifiedPickupDirectoryElement" in the link.xml and the "SmtpSpecifiedPickupDirectoryElement" they're different! There is a strange charater between the "t" and "o" of the word "Directory".

To cut a long story short: Copy "SmtpSpecifiedPickupDirectoryElement" from the error message and replace the existing one in your link.xml and it should work (we are using the same part in our link.xml).

 

OMG how did you see this??? - it's working now.

Vielen Dank

 

I searched for typos. I copied "SmtpSpecifiedPickupDirectoryElement" from the error message and searched for it in you link.xml... so bascially... just luck

 

Perfect, will remember this for the future - greetings to Germany.