Ignore boxes when they are not present in the IMAP server

Problem

With a config like:

{
  ...
  "boxes": [
    "INBOX",
    "Drafts"
  ],
  ...
}

The program exits with FATA[0001] cannot select mailbox Drafts, reason: Unknown Mailbox: Drafts (Failure), on some of my accounts (Because Drafts is [Gmail]/Drafts).

Reason why I think it's an issue

I manage my configuration with chezmoi, and have a shared template for imapnotify, so managing differences in the boxes would be a mayor inconvenience.

Proposed solution

Either through a config or commandline option you could treat Unknown Mailbox as a warning and not an error (or just by default).

Of course if all mailboxes are unknown it should be an error.