Added conditional SMTP authentication support

CHANGELOG.md

@@ -16,6 +16,12 @@ Also, any bug fix must start with the prefix �Bug fix:� followed by the desc
 
 Previous classification is not required if changes are simple or all belong to the same category.
 
+## [8.1.9]
+
+### Minor Changes
+
+- Added `AuthenticationNotRequired` property to `SmtpClientOptions.cs`, which can be set to `true` when the SMTP server does not require authentication (i.e., no username/password is needed).
+
 ## [8.1.8]
 
 ### Breaking Changes 

Directory.Build.props

@@ -16,8 +16,8 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <VersionPrefix>8.1.8</VersionPrefix>
-    <VersionSuffix></VersionSuffix>
+    <VersionPrefix>8.1.9</VersionPrefix>
+    <VersionSuffix>preview-01</VersionSuffix>
   </PropertyGroup>
 
   <!--

src/Encamina.Enmarcha.Email.Abstractions/Encamina.Enmarcha.Email.Abstractions.csproj

@@ -13,6 +13,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\Encamina.Enmarcha.Core\Encamina.Enmarcha.Core.csproj" />
     <ProjectReference Include="..\Encamina.Enmarcha.Entities.Abstractions\Encamina.Enmarcha.Entities.Abstractions.csproj" />
   </ItemGroup>
 

src/Encamina.Enmarcha.Email.Abstractions/SmtpClientOptions.cs

@@ -1,6 +1,7 @@
 using System.ComponentModel.DataAnnotations;
 using System.Net.Security;
 
+using Encamina.Enmarcha.Core.DataAnnotations;
 using Encamina.Enmarcha.Entities.Abstractions;
 
 namespace Encamina.Enmarcha.Email.Abstractions;
@@ -12,6 +13,11 @@ public class SmtpClientOptions : INameable
 {
     private string? name = null;
 
+    /// <summary>
+    /// Gets or sets a value indicating whether authentication is not required to connect to the SMTP service.
+    /// </summary>
+    public bool AuthenticationNotRequired { get; set; }
+
     /// <summary>
     /// Gets or sets the host name of the SMTP service.
     /// </summary>
@@ -28,9 +34,10 @@ public string Name
 
     /// <summary>
     /// Gets or sets the password credential required to connect to the SMTP service.
+    /// <para>This property is only required if <see cref="AuthenticationNotRequired"/> is set to <see langword="false"/>.</para>
     /// </summary>
-    [Required(AllowEmptyStrings = false)]
-    public string Password { get; set; }
+    [RequiredIf(nameof(AuthenticationNotRequired), conditionalValue: false, allowEmpty: false)]
+    public string? Password { get; set; }
 
     /// <summary>
     /// Gets or sets the port for the SMTP service. Default value is <c>587</c>.
@@ -48,9 +55,10 @@ public string Name
 
     /// <summary>
     /// Gets or sets the user credential required to connect to the SMTP service.
+    /// <para>This property is only required if <see cref="AuthenticationNotRequired"/> is set to <see langword="false"/>.</para>
     /// </summary>
-    [Required(AllowEmptyStrings = false)]
-    public string User { get; set; }
+    [RequiredIf(nameof(AuthenticationNotRequired), conditionalValue: false, allowEmpty: false)]
+    public string? User { get; set; }
 
     /// <summary>
     /// Gets or sets a value indicating whether SSL should be use. Default is <see langword="false"/>.

src/Encamina.Enmarcha.Email.MailKit/EmailService.cs

@@ -108,7 +108,12 @@ public async Task SendAsync(CancellationToken cancellationToken)
         }
 
         await smtpClient.ConnectAsync(SmtpClientOptions.Host, SmtpClientOptions.Port, SmtpClientOptions.UseSSL, cancellationToken);
-        await smtpClient.AuthenticateAsync(SmtpClientOptions.User, SmtpClientOptions.Password, cancellationToken);
+
+        if (!SmtpClientOptions.AuthenticationNotRequired)
+        {
+            await smtpClient.AuthenticateAsync(SmtpClientOptions.User, SmtpClientOptions.Password, cancellationToken);
+        }
+
         await smtpClient.SendAsync(mailMessage, cancellationToken);
         await smtpClient.DisconnectAsync(true, cancellationToken);
     }