Comcast e-mail server probably sending utility e-mails, such as PG&E, to the SPAM folder

The above is partly an assumption on my part. I use Outlook as an e-mail client. I rarely check my e-mail on the Comcast website. Over the last two months I have not received several important e-mails. These include bill notifications from utilities such as PG&E, the local water company, etc. Some of the e-mails have documents attached as bills, some do not. They just never arrived. Given that they are coming from different e-mail servers, I really, really doubt that five different companies out of the blue decided to forget to send me an e-mail notification. For about the last month, I have been opening the Comcast web based e-mail software. Several times a week I find e-mails in the Spam folder which are not Spam. All of these are from sources which I normally received e-mail from multiple times a week. I've tried selecting them as "not SPAM". It doesn't seem to change anything.

It seems very likely that the Comcast e-mail filter moved the important e-mails to the SPAM folder after which they were deleted in one week. Checking the Comcast website twice a week is not an option. From my Internet research it appears that Comcast doesn't offer a white list feature. The third sticky at the top of this forum implies that there is one, but all of the comments I can find on it say that it doesn't work. It is impossible to get in touch with anyone at Comcast who can provide actual Tech support to get this fixed. Are there any other options, besides turning off the Comcast server e-mail SPAM filter, then filtering all of the e-mail with Outlook?