Lua

Send MIME Bytes from a BinData via SMTP

Demonstrates the Chilkat MailMan.SendMimeBd method, which sends an email from caller-supplied MIME bytes held in a BinData. The arguments are the from address, the recipient list (the SMTP envelope recipients), and the BinData containing the MIME. This example loads a .eml file into a BinData and sends it.

Important: When sending caller-supplied MIME, ensure the Message-ID header is unique for each message. Sending MIME whose Message-ID was previously used can cause the message to be silently discarded as a duplicate by mail servers — see chilkatsoft.com/email_duplicate_message_id.asp.

Background: This is the binary counterpart to SendMime (which takes MIME as a string). Working from a BinData is the right choice when the message's raw bytes come straight from a file, a database blob, or a network stream — it delivers them byte-for-byte with no charset conversion that could alter the original, which matters because MIME can carry binary transfer encodings.

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Lua

local chilkat = require("chilkat")

-- Demonstrates the MailMan.SendMimeBd method, which sends an email from caller-supplied MIME
-- bytes held in a BinData.  The arguments are the from address, the recipient list (the SMTP
-- envelope recipients), and the BinData containing the MIME.

local mailman = chilkat.MailMan.new()

-- Configure the SMTP server connection.
mailman.smtp_host = "smtp.example.com"
mailman.smtp_port = 465
mailman.smtp_ssl = true
mailman.smtp_username = "user@example.com"
mailman.smtp_password = "myPassword"

-- Load the MIME bytes to send.  Here we read a .eml file, but the bytes could come from
-- any source.
local bdMime = chilkat.BinData.new()
local success = bdMime:load_file("qa_data/eml/message.eml")
if not success then
    print(bdMime.last_error_text)
    return
end

-- IMPORTANT: When sending caller-supplied MIME, make sure the Message-ID header is unique
-- for each message.  Sending MIME that contains a Message-ID that was previously sent can
-- cause the message to be silently discarded as a duplicate by mail servers.  For details,
-- see: https://www.chilkatsoft.com/email_duplicate_message_id.asp

-- Send the MIME bytes to the envelope recipient(s).
success = mailman:send_mime_bd("alice@example.com", "bob@example.com", bdMime)
if not success then
    print(mailman.last_error_text)
    return
end

print("MIME email sent.")

-- Note: The path "qa_data/eml/message.eml" is a relative local filesystem path,
-- relative to the current working directory of the running application.

-- Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
-- connects and authenticates -- using the property settings above -- whenever a server
-- operation requires it.  Calling the explicit connect/authenticate methods can still be
-- helpful to determine whether a failure occurs while connecting or while authenticating.