- GMimeFilter — Abstract filter class
- GMimeFilterBasic — Basic transfer encoding filter
- GMimeFilterBest — Determine the best charset/encoding to use for a stream
- GMimeFilterCharset — Charset-conversion filter
- GMimeFilterChecksum — Calculate a checksum
- GMimeFilterDos2Unix — Convert line-endings from Windows/DOS (CRLF) to UNIX (LF).
- GMimeFilterEnriched — Convert text/enriched or text/rtf to HTML
- GMimeFilterFrom — Escape MBox From_ lines
- GMimeFilterGZip — GNU Zip compression/decompression
- GMimeFilterHTML — Convert plain text into HTML
- GMimeFilterOpenPGP — Detect OpenPGP markers.
- GMimeFilterSmtpData — Byte-stuffs outgoing SMTP DATA.
- GMimeFilterStrip — Strip trailing whitespace from the end of lines
- GMimeFilterUnix2Dos — Convert line-endings from UNIX (LF) to Windows/DOS (CRLF).
- GMimeFilterWindows — Determine if text is in a Microsoft Windows codepage
- GMimeFilterYenc — yEncode or yDecode