Email Alias / Forwarders A No-No?

I received an email today from a hosting company that one of my clients uses saying that they were no longer going to allow usage of email aliases anymore. In the email they stated that the usage of the aliases may cause their servers to be listed as spammers.

I’ve never heard of this being an issue with servers, so it was a bit of a surprise for me. I’ve been using and recommending using email aliases and forwarders for years. I’ve never read anything else about using them causing spam or causing the email servers to be listed as spammers either.

Has anyone else heard of this?

This would be a huge impact to a variety of users I would expect. No longer could you make use of simple aliases like questions@yourdomain.com to be auto-forwarded to a group of users easily.

Instead the email address would have to be setup with its own account password and login instructions. Then one user would have to manage that account and manually forward to a team of users or figure out some other form of distribution for the emails received.

If you’ve heard of this or have proof that there really is a risk of email hosting servers being tagged as spammers due to alias usage, please let me know.