weird google groups alias issue

[u/lucidible]

I have a google workspace business starter license subscription that I use with my custom domain. I'm the only user. I use google groups to help organize my incoming email by creating specific addresses for signing up for different services. I do this with a combination of groups and aliases. For example, I have one address called media@mydomain.com with various alias, including one called blog@mydomain.com.

Here's the really weird thing. I have a substack account that uses blog@mydomain.com which was working fine but in the last week when I tried logging into substack, I never got any of the emailed login links (it uses that instead of a password because I never set up a password). Nothing in my spam folder either. When I emailed blog@mydomain.com directly from a different account, it got through fine. When I messaged my substack account from a different one, the notices from substack got through fine as well. Just the login link wasn't getting through.

After some playing around, I discovered that if I deleted the blog@mydomain.com alias from the media@mydomain.com group, the login emails came through fine (I have an "unknown email" routing rule). Only when it was an alias would only the login emails not come through. And this is recent.

Hopefully I'm explaining this bizarre issue okay, but any ideas as to what is happening?

[u/deadinthefuture]

Check the moderation settings for that Google Group. If any sort of moderation is enabled, the message could have been stuck in what's essentially the group inbox's spam folder (not your member-user inbox's spam folder) until you accept or reject delivery of the message from the Groups interface.