cognitive complexity 95 of func `(*Server).handleConnection` is high (> 30) (gocognit)

Comment should end in a period (godot)

exported: type name will be used as email.EmailAddress by other packages, and that stutters; consider calling this Address (revive)

field `from` is unused (unused)

field `to` is unused (unused)

do not define dynamic errors, use wrapped static errors instead: "fmt.Errorf(\"status code: %d, error message: %s\", resp.StatusCode, commError.Error.Message)" (err113)

do not define dynamic errors, use wrapped static errors instead: "fmt.Errorf(\"status code: %d\", resp.StatusCode)" (err113)

do not define dynamic errors, use wrapped static errors instead: "errors.New(\"server already closed\")" (err113)

do not define dynamic errors, use wrapped static errors instead: "errors.New(\"invalid mail format: missing headers or body\")" (err113)