PureBasic
Force Quoted-Printable Encoding for Email

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

PureBasic
IncludeFile "CkEmail.pb"
IncludeFile "CkMailMan.pb"

Procedure ChilkatExample()

    success.i = 0

    email.i = CkEmail::ckCreate()
    If email.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkEmail::setCkSubject(email, "test")
    CkEmail::setCkFrom(email, "bob@example.com")
    CkEmail::ckAddTo(email,"Mary","mary@example.com")

    ; Add plain-text and HTML alternative bodies.
    ; Include some "=" chars so we can see the quoted-printable encoding when used..
    CkEmail::ckAddPlainTextAlternativeBody(email,"This is a test == Hello World!")
    CkEmail::ckAddHtmlAlternativeBody(email,"<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.)
    mailman.i = CkMailMan::ckCreate()
    If mailman.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    Debug CkMailMan::ckRenderToMime(mailman,email)

    ; 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--

    Debug "----"

    ; To force quoted-printable, set the Content-Transfer-Encoding header.
    ; It will automatically propagate as needed to the MIME sub-parts.
    CkEmail::ckAddHeaderField(email,"Content-Transfer-Encoding","quoted-printable")
    Debug CkMailMan::ckRenderToMime(mailman,email)

    ; 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--


    CkEmail::ckDispose(email)
    CkMailMan::ckDispose(mailman)


    ProcedureReturn
EndProcedure