diff --git a/MimeKit/Cryptography/SecureMailboxAddress.cs b/MimeKit/Cryptography/SecureMailboxAddress.cs
index c71a6af95f..952ab12c27 100644
--- a/MimeKit/Cryptography/SecureMailboxAddress.cs
+++ b/MimeKit/Cryptography/SecureMailboxAddress.cs
@@ -91,7 +91,30 @@ public SecureMailboxAddress (Encoding encoding, string name, IEnumerable<string>
 		/// <para>-or-</para>
 		/// <para><paramref name="fingerprint"/> is <c>null</c>.</para>
 		/// </exception>
-		public SecureMailboxAddress (string name, IEnumerable<string> route, string address, string fingerprint) : base (Encoding.UTF8, name, route, address)
+		public SecureMailboxAddress (string name, IEnumerable<string> route, string address, string fingerprint) : base (name, route, address)
+		{
+			ValidateFingerprint (fingerprint);
+
+			Fingerprint = fingerprint;
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="SecureMailboxAddress"/> class.
+		/// </summary>
+		/// <remarks>
+		/// Creates a new <see cref="SecureMailboxAddress"/> with the specified fingerprint.
+		/// </remarks>
+		/// <param name="route">The route of the mailbox.</param>
+		/// <param name="address">The address of the mailbox.</param>
+		/// <param name="fingerprint">The fingerprint of the certificate belonging to the owner of the mailbox.</param>
+		/// <exception cref="System.ArgumentNullException">
+		/// <para><paramref name="route"/> is <c>null</c>.</para>
+		/// <para>-or-</para>
+		/// <para><paramref name="address"/> is <c>null</c>.</para>
+		/// <para>-or-</para>
+		/// <para><paramref name="fingerprint"/> is <c>null</c>.</para>
+		/// </exception>
+		public SecureMailboxAddress (IEnumerable<string> route, string address, string fingerprint) : base (route, address)
 		{
 			ValidateFingerprint (fingerprint);
 
@@ -136,7 +159,27 @@ public SecureMailboxAddress (Encoding encoding, string name, string address, str
 		/// <para>-or-</para>
 		/// <para><paramref name="fingerprint"/> is <c>null</c>.</para>
 		/// </exception>
-		public SecureMailboxAddress (string name, string address, string fingerprint) : base (Encoding.UTF8, name, address)
+		public SecureMailboxAddress (string name, string address, string fingerprint) : base (name, address)
+		{
+			ValidateFingerprint (fingerprint);
+
+			Fingerprint = fingerprint;
+		}
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="SecureMailboxAddress"/> class.
+		/// </summary>
+		/// <remarks>
+		/// Creates a new <see cref="SecureMailboxAddress"/> with the specified fingerprint.
+		/// </remarks>
+		/// <param name="address">The address of the mailbox.</param>
+		/// <param name="fingerprint">The fingerprint of the certificate belonging to the owner of the mailbox.</param>
+		/// <exception cref="System.ArgumentNullException">
+		/// <para><paramref name="address"/> is <c>null</c>.</para>
+		/// <para>-or-</para>
+		/// <para><paramref name="fingerprint"/> is <c>null</c>.</para>
+		/// </exception>
+		public SecureMailboxAddress (string address, string fingerprint) : base (address)
 		{
 			ValidateFingerprint (fingerprint);
 
diff --git a/MimeKit/MailboxAddress.cs b/MimeKit/MailboxAddress.cs
index 7ba285bb43..2f6585e2af 100644
--- a/MimeKit/MailboxAddress.cs
+++ b/MimeKit/MailboxAddress.cs
@@ -96,6 +96,23 @@ public MailboxAddress (string name, IEnumerable<string> route, string address) :
 		{
 		}
 
+		/// <summary>
+		/// Initializes a new instance of the <see cref="MimeKit.MailboxAddress"/> class.
+		/// </summary>
+		/// <remarks>
+		/// Creates a new <see cref="MailboxAddress"/> with the specified address and route.
+		/// </remarks>
+		/// <param name="route">The route of the mailbox.</param>
+		/// <param name="address">The address of the mailbox.</param>
+		/// <exception cref="System.ArgumentNullException">
+		/// <para><paramref name="route"/> is <c>null</c>.</para>
+		/// <para>-or-</para>
+		/// <para><paramref name="address"/> is <c>null</c>.</para>
+		/// </exception>
+		public MailboxAddress (IEnumerable<string> route, string address) : this (Encoding.UTF8, null, route, address)
+		{
+		}
+
 		/// <summary>
 		/// Initializes a new instance of the <see cref="MimeKit.MailboxAddress"/> class.
 		/// </summary>
@@ -137,6 +154,20 @@ public MailboxAddress (string name, string address) : this (Encoding.UTF8, name,
 		{
 		}
 
+		/// <summary>
+		/// Initializes a new instance of the <see cref="MimeKit.MailboxAddress"/> class.
+		/// </summary>
+		/// <remarks>
+		/// Creates a new <see cref="MailboxAddress"/> with the specified address.
+		/// </remarks>
+		/// <param name="address">The address of the mailbox.</param>
+		/// <exception cref="System.ArgumentNullException">
+		/// <paramref name="address"/> is <c>null</c>.
+		/// </exception>
+		public MailboxAddress (string address) : this (Encoding.UTF8, null, address)
+		{
+		}
+
 		/// <summary>
 		/// Clone the mailbox address.
 		/// </summary>
diff --git a/UnitTests/MailboxAddressTests.cs b/UnitTests/MailboxAddressTests.cs
index 82dba20a51..8e09ab9c96 100644
--- a/UnitTests/MailboxAddressTests.cs
+++ b/UnitTests/MailboxAddressTests.cs
@@ -26,6 +26,7 @@
 
 using System;
 using System.Text;
+using System.Collections.Generic;
 
 using NUnit.Framework;
 
@@ -48,11 +49,16 @@ public void ArgumentExceptionTests ()
 			Assert.Throws<ArgumentNullException> (() => new MailboxAddress ("name", null, "example.com"));
 			Assert.Throws<ArgumentNullException> (() => new MailboxAddress ("name", route, null));
 
+			Assert.Throws<ArgumentNullException> (() => new MailboxAddress ((IEnumerable<string>) null, "example.com"));
+			Assert.Throws<ArgumentNullException> (() => new MailboxAddress (route, null));
+
 			Assert.Throws<ArgumentNullException> (() => new MailboxAddress (null, "name", "example.com"));
 			Assert.Throws<ArgumentNullException> (() => new MailboxAddress (Encoding.UTF8, "name", null));
 
 			Assert.Throws<ArgumentNullException> (() => new MailboxAddress ("name", null));
 
+			Assert.Throws<ArgumentNullException> (() => new MailboxAddress (null));
+
 			Assert.Throws<ArgumentNullException> (() => mailbox.Encoding = null);
 
 			Assert.Throws<ArgumentNullException> (() => mailbox.CompareTo (null));