Spam filters on email are great time savers; they weed out a lot of garbage that we don’t want to see. But, they also trap a great many legitimate emails too.
If you use a spam filter, make sure it is not set to “auto delete” messages- have it put them in a junk or bulk mail folder. In addition, before you permanently delete the messages your junk mail folder, peruse through them and make sure no legitimate emails got caught in there.