ArgumentNullException for address when sending email using NetCore.MailKit

Question

I am using NetCore.MailKit NuGet package to help me send an email which contains a link to confirm their email when the user registers. I have followed the steps on their Github page but, I am getting an ArgumentNullException for the address, even though I have set the sending address.

The error:

ArgumentNullException: Value cannot be null. (Parameter 'address') MimeKit.MailboxAddress..ctor(Encoding encoding, string name, string address)

The above error occurs when is send the email in my controller using IEmailService:

_EmailService.Send("[email protected]", "subject", "message body");

This is my appsettings.json configuration:

 "EmailConfiguration": { "Server": "smtp.gmail.com", "Port": 587, "SenderName": "name", "SenderEmail": "[email protected]", "SenderPassword": "My gmail password" }

This is my setup in startup.cs

 services.AddMailKit(optionBuilder => { optionBuilder.UseMailKit(new MailKitOptions() { //get options from sercets.json Server = Configuration["Server"], Port = Convert.ToInt32(Configuration["Port"]), SenderName = Configuration["SenderName"], SenderEmail = Configuration["SenderEmail"], Account = Configuration["SenderEmail"], Password = Configuration["SenderPassword"], Security = true }); });

Below is the code for EmailService:

 public void Send(string mailTo, string subject, string message, bool isHtml = false) { SendEmail(mailTo, null, null, subject, message, Encoding.UTF8, isHtml); } private void SendEmail(string mailTo, string mailCc, string mailBcc, string subject, string message, Encoding encoding, bool isHtml) { var _to = new string[0]; var _cc = new string[0]; var _bcc = new string[0]; if (!string.IsNullOrEmpty(mailTo)) _to = mailTo.Split(',').Select(x => x.Trim()).ToArray(); if (!string.IsNullOrEmpty(mailCc)) _cc = mailCc.Split(',').Select(x => x.Trim()).ToArray(); if (!string.IsNullOrEmpty(mailBcc)) _bcc = mailBcc.Split(',').Select(x => x.Trim()).ToArray(); Check.Argument.IsNotEmpty(_to, nameof(mailTo)); Check.Argument.IsNotEmpty(message, nameof(message)); var mimeMessage = new MimeMessage(); //add mail from mimeMessage.From.Add(new MailboxAddress(_MailKitProvider.Options.SenderName, _MailKitProvider.Options.SenderEmail)); //add mail to foreach (var to in _to) { mimeMessage.To.Add(MailboxAddress.Parse(to)); } //add mail cc foreach (var cc in _cc) { mimeMessage.Cc.Add(MailboxAddress.Parse(cc)); } //add mail bcc foreach (var bcc in _bcc) { mimeMessage.Bcc.Add(MailboxAddress.Parse(bcc)); } //add subject mimeMessage.Subject = subject; //add email body TextPart body = null; if (isHtml) { body = new TextPart(TextFormat.Html); } else { body = new TextPart(TextFormat.Text); } //set email encoding body.SetText(encoding, message); //set email body mimeMessage.Body = body; using (var client = _MailKitProvider.SmtpClient) { client.Send(mimeMessage); } }

As you can see I have set everything, am I missing something here? why is address null at MimeKit.MailboxAddress()?

I have updated the question with EmailService, the rest can be found at the link I provided @JSteward — KB_Shayan
– KB_Shayan, Commented Jan 31, 2020 at 21:57
_EmailService.Send("[email protected]", "subject", "message body"); @jstedfast — KB_Shayan
– KB_Shayan, Commented Jan 31, 2020 at 22:02
No, it gets thrown inside the EmailService.SendEmail() method - but where? — jstedfast
– jstedfast, Commented Jan 31, 2020 at 22:03

Simply Ged · Accepted Answer · 2020-01-31 22:14:23Z

You seem to be not loading your configuration settings correctly. I suspect the failing line in your code is

//add mail from mimeMessage.From.Add(new MailboxAddress(_MailKitProvider.Options.SenderName, _MailKitProvider.Options.SenderEmail));

The Options are all null, which causes the exception.

When you load the settings from a configuration file you need to prepend the section name to the variables. E.G.

services.AddMailKit(optionBuilder => { optionBuilder.UseMailKit(new MailKitOptions() { //get options from sercets.json Server = Configuration["EmailConfiguration:Server"], Port = Convert.ToInt32(Configuration["EmailConfiguration:Port"]), SenderName = Configuration["EmailConfiguration:SenderName"], SenderEmail = Configuration["EmailConfiguration:SenderEmail"], Account = Configuration["EmailConfiguration:SenderEmail"], Password = Configuration["EmailConfiguration:SenderPassword"], Security = true }); });

jstedfast · Accepted Answer · 2020-01-31 22:13:14Z

My guess is that the exception is being thrown on the following line:

mimeMessage.From.Add(new MailboxAddress(_MailKitProvider.Options.SenderName, _MailKitProvider.Options.SenderEmail));

This means that _MailKitProvider.Options.SenderEmail is null.

I know you expect these values to be loaded correctly from your appsettings.json file, but seemingly, they are not being loaded for some reason.

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