As part of #97 we are going to fork the official `net/smtp` package into go-mail to provide us with more flexibility.
This commit fulfills the first big step of importing the package into smtp/. Also go-mail's own LoginAuth has been moved from auth/ into smtp/ to be consistent with the stdlib.
There are still a couple of open issues (i. e. license adjustments and making golangci-lint happy) but so far all tests already work, which is a good start.
This allows disabling the Noop command during the dial. This is useful for servers which delay potentially unwanted clients when they perform commands other than AUTH.
`Client.Send()` provides the possibility to send multiple `*Msg` in one go. If one of the `*Msg` caused an error with the sending mail server, we were returning completely, while not processing any `*Msg` that came after the failing message.
This PR fixes this behaviour by processing each message first and then return a accumulated error in case any of the `*Msg` processing failed
Additionally, this PR separates the `Client.Send()` method into two different versions. One that makes use of the new `errors.Join()` functionality that is introduced with Go 1.20 and one that handles it the old way for any supported version lower than Go 1.20
- Implemented MAIL FROM RET parameter
- Implemented RCPT TO NOTIFY parameter
Not implemented so far (not sure if we need this at all):
- MAIL FROM ENVID parameter
- RCPT TO ORCPT parameter
TBD:
- Test coverage
# SUMMARY
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* Files with copyright information: 45 / 45
* Files with license information: 45 / 45
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