Lua

Send HTML Email with CSS as Related Item using Content-Location

See more SMTP Examples

Demonstrates how to compose an HTML email with an external CSS file included as a related item and referenced by Content-Location.

Some email clients display embedded (related) content best using CID's (Content-IDs), whereas other email clients display related content best by Content-Location. The choice you make may depend on the software used by the intended recipient of your email. (Does' the recipient read email on an iPhone? Android? Outlook? GMail? Thunderbird? etc.)

Lua

local chilkat = require("chilkat")

-- This example requires the Chilkat API to have been previously unlocked.
-- See Global Unlock Sample for sample code.

-- The mailman object is used for sending and receiving email.
local mailman = chilkat.MailMan.new()

-- Use your SMTP server hostname.  This example uses office365, but it could be any SMTP server..
mailman.smtp_host = "outlook.office365.com"
mailman.smtp_port = 587
mailman.start_tls = true

-- Set the SMTP login/password
mailman.smtp_username = "OFFICE365-SMTP-LOGIN"
mailman.smtp_password = "OFFICE365-SMTP-PASSWORD"

-- Create a new email object
local email = chilkat.Email.new()
email.subject = "HTML Email with embedded CSS"
email.from = "Chilkat Support <my-office365-user@mydomain.com>"
email:add_to("Chilkat Support", "support@chilkatsoft.com")

local sbCss = chilkat.StringBuilder.new()
local bCrlf = true
sbCss:append_line("body {", bCrlf)
sbCss:append_line("    background-color: powderblue;", bCrlf)
sbCss:append_line("}", bCrlf)
sbCss:append_line("h1 {", bCrlf)
sbCss:append_line("    color: blue;", bCrlf)
sbCss:append_line("}", bCrlf)
sbCss:append_line("p {", bCrlf)
sbCss:append_line("    color: red;", bCrlf)
sbCss:append_line("}", bCrlf)

-- The filenameInHtml is what should exists within the HTML (in the href atribute)
local filenameInHtml = "styles.css"
-- Call AddRelatedString2 to use Content-Location.
email:add_related_string2(filenameInHtml, sbCss:get_as_string(), "utf-8")

local sbHtml = chilkat.StringBuilder.new()
sbHtml:append_line("<!DOCTYPE html>", bCrlf)
sbHtml:append_line("<html>", bCrlf)
sbHtml:append_line("<head>", bCrlf)
sbHtml:append_line("  <link rel=\"stylesheet\" href=\"styles.css\">", bCrlf)
sbHtml:append_line("</head>", bCrlf)
sbHtml:append_line("<body>", bCrlf)
sbHtml:append_line("", bCrlf)
sbHtml:append_line("<h1>This is a heading</h1>", bCrlf)
sbHtml:append_line("<p>This is a paragraph.</p>", bCrlf)
sbHtml:append_line("", bCrlf)
sbHtml:append_line("</body>", bCrlf)
sbHtml:append_line("</html>", bCrlf)

email:set_html_body(sbHtml:get_as_string())

local success = mailman:send_email(email)
if not success then
    print(mailman.last_error_text)
else
    print("Mail Sent!")
end