| Field | Mail::Internet | manipulate Internet format mail messages | |
| Mail::Address | Parse mail addresses | Mail::Mailer | Simple interface to electronic mailing mechanisms |
| Mail::Cap | Parse mailcap files | Mail::Send | Simple electronic mail interface |
| Mail::Field | Base class for manipulation of mail header fields | Mail::Util | mail utility functions |
| Mail::Filter | Filter mail through multiple subroutines | Mailer | |
| Mail::Header | manipulate mail RFC822 compliant headers |