2. Getting Started

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Chapter 3: Attachments Chapter 1: Introduction Chapter 2. Getting Started

2.1 Creating an Instance of the AspEmail Object
2.2 Essential Properties and Methods
2.3 Code Samples
2.4 Email Address Validation

2.1 Creating an Instance of the AspEmail Object


To use AspEmail in an ASP environment, you must create an instance of the AspEmail object in your ASP script as follows:

Set Mail = Server.CreateObject("Persits.MailSender")


To use AspEmail in a VB environment, open your VB project, go to Project/References... and check the box next to Persits Software AspEmail 5.0. Declare an AspEmail object variable as follows:

Dim Mail As MailSender

Create an instance of the AspEmail object as follows:

Set Mail = New MailSender


AspEmail comes with an ASP.NET wrapper assembly, ASPEMAILLib.dll, which has to be placed in the \Bin subdirectory of your ASP.NET application. Alternatively, you can place this file in the Global Assembly Cache.

In C#, create an instance of AspEmail as follows:

<%@ Import Namespace="ASPEMAILLib" %>
<script runat="server" LANGUAGE="C#">
void Page_Load(Object Source, EventArgs E)
ASPEMAILLib.IMailSender objMail;
objMail = new ASPEMAILLib.MailSender();

2.2 Essential Properties and Methods
In order to send email, AspEmail "talks" to an SMTP server. The SMTP server does not have to be running on the same machine as AspEmail, in fact it can be located anywhere on the local network or the Internet.

You must specify the address of your SMTP server via the Host property. The default port number for SMTP services is 25, but if your SMTP server runs on a different port, you must also specify it via the Port property:

Mail.Host = "smtp.mycompany.com" ' Required
Mail.Port = 25
' Optional. Port is 25 by default

You may also specify a comma- or semicolon-separated list of SMTP hosts, as follows:

Mail.Host = "smtp.domain1.com;smtp2.domain1.com;host.domain2.com"

If the first host on the list is down, AspEmail will automatically attempt to connect to the second host, etc. If none of the specified hosts are working, an error exception will be thrown.

You must also specify the sender's email address and, optionally, name as follows:

Mail.From = "sales@mycompany.com" ' Required
Mail.FromName = "Sales Department"
' Optional

To add message recipients, CCs, BCCs, and Reply-To's, use the AddAddress, AddCC, AddBcc and AddReplyTo methods, respectively. These methods accept two parameters: the email address and, optionally, name. Notice that you must not use an '=' sign to pass values to the methods. For example,

Mail.AddAddress "jsmith@company1.com", "John Smith"
Mail.AddCC "bjohnson@company2.com"
' Name is optional

Use the Subject and Body properties to specify the message subject and body text, respectively. A body can be in a text or HTML format. In the latter case, you must also set the IsHTML property to True. For example,

' text format
Mail.Subject = "Sales Receipt"
Mail.Body = "Dear John:" & chr(13) & chr(10) & "Thank you for your business. Here is your receipt."


' HTML format
Mail.Subject = "Sales Receipt"
Mail.Body = "<HTML><BODY BGCOLOR=#0000FF>Dear John:....</BODY></HTML>"
Mail.IsHTML = True

To send a file attachment with a message, use the AddAttachment method. It accepts the full path to a file being attached. Call this method as many times as you have attachments. Notice that you must not use the '=' sign to pass a value to the method:

Mail.AddAttachment "c:\dir\receipt.doc"

To send a message, call the Send method. The method throws exceptions in case of an error. You may choose to handle them by using the On Error Resume Next statement, as follows:

On Error Resume Next
If Err <> 0 Then
  Response.Write "An error occurred: " & Err.Description
End If

2.3 Code Samples
The following code sample demonstrates a simple email-sending form.

' change to address of your own SMTP server
strHost = "mail.elinkisp.com"

If Request("Send") <> "" Then
   Set Mail = Server.CreateObject("Persits.MailSender")
   ' enter valid SMTP host
   Mail.Host = strHost

   Mail.From = Request("From") ' From address
   Mail.FromName = Request("FromName") ' optional
   Mail.AddAddress Request("To")

   ' message subject
   Mail.Subject = Request("Subject")
   ' message body
   Mail.Body = Request("Body")
   strErr = ""
   bSuccess = False
   On Error Resume Next ' catch errors
   Mail.Send ' send message
   If Err <> 0 Then ' error occurred
      strErr = Err.Description
      bSuccess = True
   End If
End If

<% If strErr <> "" Then %>
<h3>Error occurred: <% = strErr %>
<% End If %>
<% If bSuccess Then %>
Success! Message sent to <% = Request("To") %>.
<% End If %>
   <TD>Host (change as necessary in script):</TD>
   <TD><B><% = strHost %></B></TD>
   <TD>From (enter sender's address):</TD>
   <TD>FromName (optional, enter sender's name):</TD>
   <TD><INPUT TYPE="TEXT" NAME="FromName"></TD>
   <TD>To: (enter one recipient's address):</TD>
   <TD><INPUT TYPE="TEXT" NAME="Subject"></TD>

Click the links below to run this code sample (ASP and ASP.NET versions, respectively):

http://localhost/aspemail/Simple/Simple.aspx .NET Version

The following code sample sends email in the HTML format. The script is essentially the same except that the message body is set to an HTML string, and the property IsHTML is set to True:

strHTML = message body in HTML format
Mail.IsHTML = True
Mail.Body = "<HTML><BODY><CENTER>" & strHTML & "</CENTER></BODY></HTML>"

Click the links below to run this code sample.

http://localhost/aspemail/HtmlFormat/HtmlFormat.aspx .NET Version

2.4 Email Address Validation
AspEmail is capable of validating the syntax of an email address. As of Version 5.2, it is also able to determine, with a high degree of certainty, whether a particular email address actually exists.

The method ValidateAddress takes an email address as an argument and returns 0 if the address is syntactically valid. A number greater than 0 means a syntax error. All possible return values are as follows:

1Too short
2Too long (greater than 256 chars)
3No @
4Nothing before @
5Characters before @ must be a-z A-Z 0-9 ' _ . - +
6No dots after @
7Zero-length subdomain
8Characters in a subdomain must be a-z A-Z 0-9 -
9Characters in a top-level subdomain must be a-z A-Z 0-9
10Top-level subdomain must be at least 2 characters long
11Name part of address cannot start or end with a dot
12A subdomain cannot start or end with a dash (-)

For example:

If Mail.ValidateAddress( Email ) <> 0 Then
   Response.Write "Invalid email address."
End If

The ValidateAddress method makes no determination whether the email address being validated actually exists. As of Version 5.2, AspEmail offers another method, ValidateAddressMX, which internally calls ValidateAddress to determine its syntactic correctness, performs a DNS lookup of the MX records for the address's domain, and then contacts the corresponding SMTP server to determine if it recognizes the address as valid.

ValidateAddressMX expects two arguments: the email address being validated and, optionally, the IP address of the DNS server for the MX record lookup. If the 2nd argument is omitted, the method obtains the addresses of the local DNS servers from the system registry. ValidateAddressMX returns an empty string if the email address is successfully validated, or an error message if the validation fails.

To validate an address against its corresponding SMTP server, ValidateAddressMX sends three SMTP commands: HELO, MAIL FROM and RCPT TO. The value used for the HELO command is the Helo property, for the MAIL FROM command the MailFrom property, and for the RCPT TO command the address being validated. If MailFrom is not specified, the address being validated is used for the MAIL FROM command as well. It is recommended that you specify your domain name for the Helo property, and your valid email address for the MailFrom property before calling ValidateAddressMX, as follows:

Mail.Helo = "mydomain.com"
Mail.MailFrom = "myself@mydomain.com"
Res = Mail.ValidateAddressMX( "someone@somedomain.com" )
If Res = "" Then
   Response.Write "OK"
   Response.Write "Not OK: " & Res
End If

Note that the validation procedure performed by the ValidateAddressMX method is not 100% accurate. An error returned by the method does not always mean the address is invalid, and a lack of error is not always an indication the address exists.

Chapter 3: Attachments Chapter 1: Introduction 


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