SQL Server
Force Quoted-Printable Encoding for Email

Demonstrates how to force the quoted-printable encoding for email.
Chilkat SQL Server Downloads

SQL Server
-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    DECLARE @email int
    EXEC @hr = sp_OACreate 'Chilkat.Email', @email OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OASetProperty @email, 'Subject', 'test'
    EXEC sp_OASetProperty @email, 'From', 'bob@example.com'
    EXEC sp_OAMethod @email, 'AddTo', @success OUT, 'Mary', 'mary@example.com'

    -- Add plain-text and HTML alternative bodies.
    -- Include some "=" chars so we can see the quoted-printable encoding when used..
    EXEC sp_OAMethod @email, 'AddPlainTextAlternativeBody', @success OUT, 'This is a test == Hello World!'
    EXEC sp_OAMethod @email, 'AddHtmlAlternativeBody', @success OUT, '<html><body>This is a test == Hello World!</body></html>'

    -- Examine the MIME of the email to see that it does not use quoted-printable.
    -- (If the email contained non-usascii chars, it would automatically use quoted-printable.)
    DECLARE @mailman int
    EXEC @hr = sp_OACreate 'Chilkat.MailMan', @mailman OUT

    EXEC sp_OAMethod @mailman, 'RenderToMime', @sTmp0 OUT, @email
    PRINT @sTmp0

    -- Here is the MIME before forcing quoted-printable.
    -- Notice the Content-Transfer-Encoding is "7bit" (not "quoted-printable")

    -- MIME-Version: 1.0
    -- Date: Tue, 29 Sep 2020 12:26:52 -0500
    -- Message-ID: <CF274FC0A2F82B98A05B7507DF7DFB966A2C0EB8@CHILKATSLICE>
    -- Content-Type: multipart/alternative;
    --  boundary="------------080901080902080000030208"
    -- X-Priority: 3 (Normal)
    -- Subject: test
    -- From: bob@example.com
    -- To: Mary <mary@example.com>
    -- 
    -- --------------080901080902080000030208
    -- Content-Transfer-Encoding: 7bit
    -- Content-Type: text/plain; charset=us-ascii; format=flowed
    -- 
    -- This is a test == Hello World!
    -- --------------080901080902080000030208
    -- Content-Transfer-Encoding: 7bit
    -- Content-Type: text/html; charset=us-ascii
    -- 
    -- <html><body>This is a test == Hello World!</body></html>
    -- --------------080901080902080000030208--


    PRINT '----'

    -- To force quoted-printable, set the Content-Transfer-Encoding header.
    -- It will automatically propagate as needed to the MIME sub-parts.
    EXEC sp_OAMethod @email, 'AddHeaderField', NULL, 'Content-Transfer-Encoding', 'quoted-printable'
    EXEC sp_OAMethod @mailman, 'RenderToMime', @sTmp0 OUT, @email
    PRINT @sTmp0

    -- MIME-Version: 1.0
    -- Date: Tue, 29 Sep 2020 12:26:52 -0500
    -- Message-ID: <F36B276E3A720FE5111D15CE9142C8909E1F5AB9@CHILKATSLICE>
    -- Content-Type: multipart/alternative;
    --  boundary="------------080901080902080000030208"
    -- X-Priority: 3 (Normal)
    -- Subject: test
    -- From: bob@example.com
    -- To: Mary <mary@example.com>
    -- 
    -- --------------080901080902080000030208
    -- Content-Transfer-Encoding: quoted-printable
    -- Content-Type: text/plain; charset=us-ascii; format=flowed
    -- 
    -- This is a test =3D=3D Hello World!
    -- --------------080901080902080000030208
    -- Content-Transfer-Encoding: quoted-printable
    -- Content-Type: text/html; charset=us-ascii
    -- 
    -- <html><body>This is a test =3D=3D Hello World!</body></html>
    -- --------------080901080902080000030208--

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


END
GO