So how do you suggest I get my mail when it is addressed in both names.
Well, for those accounts that are unrelated to your trust, you will probably have to call your utility providers and update the name on the account. If investments are in the name of your trust, and your H has since passed, I'd suggest that you request the brokerages you are using, or perhaps the banks update their mailing label to you as the trustee of the {name of the trust}. So, if you and your H set up your accounts to be called the John Smith and Jane Smith Revocable Living Trust dated x/xx/xx, since your H passed, and you are the sole trustee of the trust, you can request that they address your account as Jane Smith, Trustee of the John Smith and Jane Smith Revocable Living Trust....
Just as an example, I am the successor trustee of a trust that doesn't contain my name at all. Once I became the successor trustee, I updated all accounts to be addressed to [my name, successor trustee of the XXX trust], and then my address. In this particular matter, the original grantor is still living, but resigned as trustee, and thus I had to provide to the financial institution the notarized resignation of trustee, and the successor trustee info from the original trust that named me. If you've updated your financial accounts to reflect the passing of your H, then there should not be an issue with you, as sole trustee, updating the addressee.
As to the USPS, I'd use your name to do the mail forwarding, and then check the box for all mail in household.
I don't understand why your utility companies refuse to update the account, especially since you've provided them with the death certificate.
What other types of mail come addressed to both names?