MIME Email Encoding in Python
How to encode and decode MIME emails in Python — using email.mime, quopri, and base64 modules.
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Tags: MIME email encoding Python, Python email.mime module, quopri Python MIME
MIME Email Encoding in Python Part of our complete guide to this topic — see the full series. Python's standard library has everything you need to build, send, parse, and decode MIME emails. This guide covers the key modules: , , , and . RFC 2045-2049 MIME standards define email encoding used by 5+ billion email users globally. --- All the tools discussed here are available for free at theproductguy.in — client-side, no sign-up required. What is the Python's Email architecture? Python's package (standard library) is the foundation for working with MIME messages. Key submodules: | Module | Purpose | |--------|---------| | | Base message class | | | Plain text and HTML parts | | | Messages with multiple parts/attachments | | | Base class for attachments | | | Application/* content types | |…
Frequently Asked Questions
How do I send MIME emails in Python?
Use the email package in Python's standard library. Build a message with email.mime.multipart.MIMEMultipart for messages with attachments, or email.mime.text.MIMEText for plain text/HTML. Set headers like Subject, From, and To directly. Send via smtplib: create an SMTP connection, call sendmail() or send_message(). The email package handles MIME encoding automatically.
How do I decode MIME encoded headers in Python?
Use email.header.decode_header() which returns a list of (decoded_bytes, charset) tuples. Then decode each bytes object using the specified charset. For a complete solution: parts = email.header.decode_header(header_value); result = ''.join(part.decode(charset or 'ascii') if isinstance(part, bytes) else part for part, charset in parts).
What is the quopri module?
quopri is a Python standard library module for encoding and decoding quoted-printable data. quopri.encodestring(data) encodes bytes as quoted-printable, returning bytes. quopri.decodestring(data) decodes quoted-printable bytes. The module handles the =XX escaping and soft line breaks automatically.
How do I add attachments to email in Python?
Use MIMEBase or MIMEApplication for attachments. Read the file as binary, create a MIMEBase object with the appropriate content type, set the payload with encoders.encode_base64() to base64-encode it, add a Content-Disposition header with filename, and attach it to a MIMEMultipart message. Python's email.encoders.encode_base64() handles the base64 encoding.
What is email.header.decode_header()?
email.header.decode_header() parses RFC 2047 encoded words in email headers and returns a list of (raw_bytes, charset) tuples. It does NOT decode the bytes for you — you must call bytes.decode(charset) on each item. The function handles multiple encoded words in a single header value. It is the standard way to parse international characters in Subject and From headers.
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