Lua

Force Quoted-Printable Encoding for Email

See more Email Object Examples

Demonstrates how to force the quoted-printable encoding for email. Lua

local chilkat = require("chilkat")

local success = false

local email = chilkat.Email.new()

email.subject = "test"
email.from = "bob@example.com"
email:add_to("Mary", "mary@example.com")

-- Add plain-text and HTML alternative bodies.
-- Include some "=" chars so we can see the quoted-printable encoding when used..
email:add_plain_text_alternative_body("This is a test == Hello World!")
email:add_html_alternative_body("<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.)
local mailman = chilkat.MailMan.new()
print(mailman:render_to_mime(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--

print("----")

-- To force quoted-printable, set the Content-Transfer-Encoding header.
-- It will automatically propagate as needed to the MIME sub-parts.
email:add_header_field("Content-Transfer-Encoding", "quoted-printable")
print(mailman:render_to_mime(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--