Cs-Cart Not Sending Emails

I run two stores on the same Cs-Cart (4.3.1) installation. One of my stores sends emails fine, but the other doesn’t. It will not send emails notifying about profile changes, messages etc. but order confirmation emails are working.

Any tips on where the issues might be? The email sending settings are of course the same for both stores, since they can’t be edited on a store basis.