Setting multiple SMTP settings in web.config?

Question

I am building an app that needs to dynamically/programatically know of and use different SMTP settings when sending email.

I\'m used to using the system.net/mailSet

Answer 1

This is how i use it and it works fine for me (settings are similar to Mikko answer):

1. First set up config sections:

2. Then it would be the best to create a some sort of wrapper. Note that most of code below was taken from .NET source code for SmtpClient here

   public class CustomSmtpClient
   {
       private readonly SmtpClient _smtpClient;
   
       public CustomSmtpClient(string sectionName = "default")
       {
           SmtpSection section = (SmtpSection)ConfigurationManager.GetSection("mailSettings/" + sectionName);
   
           _smtpClient = new SmtpClient();
   
           if (section != null)
           {
               if (section.Network != null)
               {
                   _smtpClient.Host = section.Network.Host;
                   _smtpClient.Port = section.Network.Port;
                   _smtpClient.UseDefaultCredentials = section.Network.DefaultCredentials;
   
                   _smtpClient.Credentials = new NetworkCredential(section.Network.UserName, section.Network.Password, section.Network.ClientDomain);
                   _smtpClient.EnableSsl = section.Network.EnableSsl;
   
                   if (section.Network.TargetName != null)
                       _smtpClient.TargetName = section.Network.TargetName;
               }
   
               _smtpClient.DeliveryMethod = section.DeliveryMethod;
               if (section.SpecifiedPickupDirectory != null && section.SpecifiedPickupDirectory.PickupDirectoryLocation != null)
                   _smtpClient.PickupDirectoryLocation = section.SpecifiedPickupDirectory.PickupDirectoryLocation;
           }
       }
   
       public void Send(MailMessage message)
       {
           _smtpClient.Send(message);
       }
   

   }

3. Then simply send email:

   new CustomSmtpClient("mailings").Send(new MailMessage())