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The attribute 'deliveryFormat' is not serialized from 'system.net/mailsettings/smtp' which causes an exception at runtime:
Error deserializing configuration section smtp: Unrecognized attribute 'deliveryFormat'.
at System.Configuration.ConfigurationSection.DeserializeSection (System.Xml.XmlReader reader)
To reproduce, create a new instance of the SmtpClient (var mailClient = new System.Net.Mail.SmtpClient(...)) and have the relevant configuration setup in the web.config/app.config.
Workaround: Remove the attribute from the .config XML, though what format it's in, I don't know.
The property is missing from https://github.com/mono/mono/blob/master/mcs/class/System/System.Net.Configuration/SmtpSection.cs, but is defined at https://msdn.microsoft.com/en-us/library/ms164240(v=vs.110).aspx
I can't find any information about this at all, as to whether there's some reason it's left off, but it's certainly a bug.
Tested on 4.2.2 on ArchLinux, packaged Mono
Fixed in master
Ok, thanks,but presumably this value is still ignored by the default System.Net.Mail SmtpClient? Shouldn't this be functionally equivalent to the MS version?