| container/list | Package list implements a doubly linked list. |
| github.com/emersion/go-message | Package message implements reading and writing multipurpose messages. |
| github.com/emersion/go-message/charset | Package charset provides functions to decode and encode charsets. |
| io | Package io provides basic interfaces to I/O primitives. |
| net/mail | Package mail implements parsing of mail messages. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| time | Package time provides functionality for measuring and displaying time. |