We are having an ongoing issue with the automated newsletter publishing system. We often want to include older articles in our newsletters, but we have no way of knowing at a quick glance if particular articles have or have not already been published in prior newsletters.
The workaround we have in place now is to only use manual newsletter creation and include "NEWSLETTER" in the note field for each article as it gets used. Then we scan through the Article Manager for articles without this note attached. This is very time consuming!
But what we really need is for there to be some indication of every article's status either in the native Joomla Article Manager, or better yet in the article chooser in AcyMailing when creating Content tags. In the case of the latter we could then just create a tag with (for example) the three most recent articles that have not been in prior newsletters.
As a test I have tried implementing Joomla's custom fields, but this has been a dead end so far. Here's what I did:
Create a custom field of the type "integer" with only two options - 0 or 1 (0 meaning the article has not been posted; 1 meaning it has):

Select 1 for a single article as a test:


Attempt to create a tag that somehow uses articles that only have 0 in the custom field. However, in AcyMailing's tag creation popup, there is only the option to show the tag for each article in the newsletter body (see the "Custom Fields" section in the middle of this screen shot):

So that doesn't seem like it will be of much use. At least AcyMailing can see the tags... now if only it could use them the way I want.
Any other ideas? We have hundreds of articles on our site and this is a really important function to us!