Attachments in net.smtp.Mail

[DarkCat09]

Describe the feature

Possibility to add attachments to an email.

Use Case

1. Some complicated cases with automated mailing.
2. Mail clients made with V UI (related to Implement net.mail with support for the SMTP, POP3 and IMAP protocols #11634).

Proposed Solution

Maybe it's better to add net.smtp.Attachment struct, and then attachments []Attachment field to net.smtp.Mail.

Every attachment contains:

• representation of a file, either its path or []u8 buffer -- I'm new to Vlang, so I don't know how the implementaion should be done;
• file mime type, if it is required by RFC;
• ...

Also, I quickly gone through the RFC. This part might help...

For example, a two part message consisting of a text and a
BASE64-encoded text attachment can have a body structure of:
(("TEXT" "PLAIN" ("CHARSET" "US-ASCII") NIL NIL "7BIT" 1152 23)("TEXT" "PLAIN" ("CHARSET" "US-ASCII" "NAME" "cc.diff") "<[email protected]>" "Compiler diff" "BASE64" 4554 73) "MIXED")

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

Version used

0.4.3

Environment details (OS name and version, etc.)

V full version: V 0.4.3 55cac88.373da77
OS: linux, "Artix Linux"
Processor: 12 cpus, 64bit, [***]

getwd: /home/[***]
vexe: /home/[***]/v/v
vexe mtime: 2023-11-17 13:38:45

vroot: OK, value: /home/[***]/v
VMODULES: OK, value: /home/[***]/.vmodules
VTMP: OK, value: /tmp/v_1000

Git version: git version 2.42.1
Git vroot status: weekly.2023.45.1-65-g373da777 (3 commit(s) behind V master)
.git/config present: true

CC version: cc (GCC) 13.2.1 20230801
thirdparty/tcc status: thirdparty-linux-amd64 12f392c3

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