| bytes | Package bytes implements functions for the manipulation of byte slices. |
| crypto | Package crypto collects common cryptographic constants. |
| crypto/x509 | Package x509 implements a subset of the X.509 standard. |
| encoding/pem | Package pem implements the PEM data encoding, which originated in Privacy Enhanced Mail. |
| flag | Package flag implements command-line flag parsing. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/emersion/go-milter | |
| github.com/emersion/go-msgauth/authres | Package authres parses and formats Authentication-Results |
| github.com/emersion/go-msgauth/dkim | Package dkim creates and verifies DKIM signatures, as specified in RFC 6376. |
| golang.org/x/crypto/ed25519 | Package ed25519 implements the Ed25519 signature algorithm. |
| io | Package io provides basic interfaces to I/O primitives. |
| io/ioutil | Package ioutil implements some I/O utility functions. |
| log | Package log implements a simple logging package. |
| net | Package net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. |
| net/mail | Package mail implements parsing of mail messages. |
| net/textproto | Package textproto implements generic support for text-based request/response protocols in the style of HTTP, NNTP, and SMTP. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| os/signal | Package signal implements access to incoming signals. |
| path | Package path implements utility routines for manipulating slash-separated paths. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| syscall | Package syscall contains an interface to the low-level operating system primitives. |