TL;DR - If a Guild Leader posts an Announcement, it should be flagged up on the Messages Icon for the Members of that Guild.
A little background: At the moment, the Guild I am in has 30 members, but not all of them are actively participating in Guild Wars. Some have fought a few battles on Day 1, others intermittantly take part and a few haven’t taken part at all.
Now this may be that they’re not interested, but it could be they don’t know what to do or don’t realise that it’s a series of battles every day.
Our Guild Leader has posted an Announcement at the top of the Guild Chat, but if players don’t actually bother to look at the chat, they’re never going to know it’s there.
Now, yes, the GL could kick them, but that’s a bit extreme, so the suggestion is simply that if the Guild Leader posts an Announcement, it’s flagged up on the Mail icon, just like Daily Rewards or someone completing a Task.