NLog Mail target fails when used in a web application - email

Question

I've just upgraded NLog in my NancyFx web application to version 4.3.2 and the app now throws an error the first time it tries to get a Logger instance. The error being thrown is:
exePath must be specified when not running inside a stand alone exe
I've narrowed the problem down to the NLog Mail target, which (according to its source) is attempting to read:
System.Configuration.ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None).GetSection("system.net/mailSettings/smtp")
as SmtpSection
...to try to find the mail setting from the app's web.config file. The OpenExeConfiguration is expecting an app.exe.config file, which doesn't exist for a web app.
So, my question is how do I tell NLog where to find the web.config file, or better still, how can I tell NLog not to bother looking in the web.config file at all as I'm not storing any mail settings there?
Here's my target xml in nlog.config:
<target xsi:type="Mail"
name="smtplog"
layout="${longdate} ${logger} ${message}"
useSystemNetMailSettings="false"
to="test-to#test.com"
from="test-from#test.com"
smtpUserName="USERNAME"
enableSsl="True"
smtpPassword="PASSWORD"
smtpAuthentication="Basic"
smtpServer="smtp.sendgrid.net"
smtpPort="587" />
If I remove the target then the app loads fine.
ps this was working just fine with the earlier version of NLog I was using (v2.1.0)

Answer 1

This is a bug in NLog 4.3.2 and has been fixed in 4.3.3