- GMimeObject — Abstract MIME objects
- GMimeMessage — Messages
- GMimePart — MIME parts
- GMimeTextPart — textual MIME parts
- GMimeMultipart — MIME multiparts
- GMimeMultipartEncrypted — Encrypted MIME multiparts
- GMimeMultipartSigned — Signed MIME multiparts
- GMimeApplicationPkcs7Mime — Pkcs7 MIME parts
- GMimeMessagePart — Message parts
- GMimeMessagePartial — Partial MIME parts
- GMimePartIter — MIME part iterators