Chilkat2-Python

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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import sys
import chilkat2

success = False

# 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.

mailman = chilkat2.MailMan()

# Configure the SMTP server connection.
mailman.SmtpHost = "smtp.example.com"
mailman.SmtpPort = 465
mailman.SmtpSsl = True
mailman.SmtpUsername = "user@example.com"
mailman.SmtpPassword = "myPassword"

# Load the MIME bytes to send.  Here we read a .eml file, but the bytes could come from
# any source.
bdMime = chilkat2.BinData()
success = bdMime.LoadFile("qa_data/eml/message.eml")
if (success == False):
    print(bdMime.LastErrorText)
    sys.exit()

# 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.SendMimeBd("alice@example.com","bob@example.com",bdMime)
if (success == False):
    print(mailman.LastErrorText)
    sys.exit()

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.