(SQL Server) Send Email without Mail Server

How to send an email without a mail server (so-to-speak).

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    -- Is it really possible to send email without connecting to
    -- a mail server?  Not really.

    -- When people ask 'Do you support sending email without 
    -- a mail server'?  what they're really asking is: 'I don't
    -- have an SMTP server, and I want to send email.  I see
    -- other components available where it's not necessary
    -- to specify an SMTP server.  Does your component have that
    -- ability?'  In short, the answer is Yes.  But you need
    -- to understand some things before you jump in...

    -- Here's what happens inside those other components
    -- that claim to not need a mail server:  The component does
    -- a DNS MX lookup using the intended recipient's email address
    -- to find the mail server (i.e. SMTP server) for that
    -- domain.  It then connects to that server and delivers the
    -- email.  You're still connecting to an SMTP server -- just
    -- not YOUR server.

    -- Chilkat provides an MxLookup method where you can lookup
    -- the SMTP hostname that services any given email address. 
    -- You would then assign the SmtpHost property to this value.
    -- Chilkat can then connect directly to the recipient's mail 
    -- server and deliver the email.

    -- There are a few gotcha's though...

    -- First, if you're writing an application that is widely 
    -- distributed, your app might be running within a network
    -- that blocks outgoing connections to the SMTP port.
    -- Earthlink, for example, is one major ISP that does this.
    -- When you are connected to the Internet via Earthlink,
    -- your apps can *only* connect to Earthlink's SMTP server
    -- and will not be able to reach any remote servers.  To send
    -- email, you must use Earthlink's SMTP as a relay.  This is
    -- common with ISPs.  So... if your application is coded
    -- as in this example, it will not work within those networks.
    -- 
    -- Second, some SMTP servers will reject unauthenticated
    -- sessions attempting to send email from dynamic IP addresses.
    -- You may see this error in your LastErrorText:
    -- 553-Your attempt to send email to us has been blocked
    -- 553-because your email server is not currently on that domain's Accepted
    -- 553-Senders list. To request addition to their Accepted Senders list,
    -- 553-please navigate with a Web browser to the following URL:
    -- 553-http://reportrbl.gate2service.com/Whitelist/?IPAddress=67.173.123.150
    -- 553 See http://www.dnsbl.us.sorbs.net/ (dul)

    -- In a nutshell, just because you were able to do the MxLookup
    -- and connect to the recipient's mail server, doesn't mean
    -- you'll be able to send email -- it depends on the IP address
    -- from which you're connecting.

    -- Finally, the DNS lookup is potentially time consuming.
    -- In addition, you cannot use somebody else's email server
    -- as a relay, so if you're connecting to smtp.xyz.com, you
    -- can only send email to email addresses at xyz.com.
    -- To send email to 3 recipients at different domains means
    -- making 3 separate connections to 3 separate SMTP servers
    -- to send the email one at a time.

    -- The mailman object is used for sending and receiving email.
    DECLARE @mailman int
    -- Use "Chilkat_9_5_0.MailMan" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.MailMan', @mailman OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @recipient nvarchar(4000)
    SELECT @recipient = 'admin@chilkatsoft.com'

    -- Do a DNS MX lookup for the recipient's mail server.
    DECLARE @smtpHostname nvarchar(4000)

    EXEC sp_OAMethod @mailman, 'MxLookup', @smtpHostname OUT, @recipient
    EXEC sp_OAGetProperty @mailman, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @mailman
        RETURN
      END


    PRINT @smtpHostname

    -- Set the SMTP server.
    EXEC sp_OASetProperty @mailman, 'SmtpHost', @smtpHostname

    -- Create a new email object
    DECLARE @email int
    -- Use "Chilkat_9_5_0.Email" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Email', @email OUT

    EXEC sp_OASetProperty @email, 'Subject', 'This is a test'
    EXEC sp_OASetProperty @email, 'Body', 'This is a test'
    EXEC sp_OASetProperty @email, 'From', 'My Name <myname@mydomain.com>'
    DECLARE @success int
    EXEC sp_OAMethod @email, 'AddTo', @success OUT, '', @recipient

    DECLARE @success int
    EXEC sp_OAMethod @mailman, 'SendEmail', @success OUT, @email
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @mailman, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
      END
    ELSE
      BEGIN

        PRINT 'Mail Sent!'
      END

    EXEC @hr = sp_OADestroy @mailman
    EXEC @hr = sp_OADestroy @email


END
GO