fix: correct Unkown→Unknown typo in SMTP error message (mail/smtp.go)

[Jah-yee]

Summary

Fixes: errors.New("Unkown fromServer") → errors.New("Unknown fromServer") in mail/smtp.go line 464.

Details

• File: mail/smtp.go
• Line: 464
• Change: Unkown → Unknown
• Context: SMTP client initialization error message (user-facing)
• 1 file, 1 line change

Verification

return nil, errors.New("Unknown fromServer")

This is a user-facing error returned when SMTP server configuration is invalid.

[Jah-yee]

Hi @3xxx! This PR fixes a user-facing Unkown→Unknown typo in the SMTP error message (line 464 of mail/smtp.go). The fix is minimal (1 commit, 1 line) and mergeable_state=clean. Hope you can take a look — happy to adjust if needed! 🙏