Prove You Mailed It: Northern District of Illinois Dismisses ERISA Disability Suit for Failure to Exhaust After Claimant Cannot Establish He Sent His Appeal

In Stempel v. Unum Life Insurance Company of America, No. 24 C 6077, 2026 WL 2241244 (N.D. Ill. Aug. 4, 2026), United States District Judge John F. Kness granted judgment to Unum on an ERISA long-term disability claim, holding that the claimant failed to exhaust his administrative remedies because he could not prove he ever mailed a timely appeal. The decision is a stark reminder that, in an ERISA benefits dispute, the burden of proving a timely appeal rests on the claimant, and that burden is not carried by testimony a court finds not credible. The court did not reach the merits of whether Unum wrongly denied benefits. The case turned entirely on exhaustion.

What was the ERISA dispute about?

Plaintiff, a former partner at a large law firm, filed a claim in May 2021 for long-term disability benefits under a group plan Unum issued to his former employer. Unum denied the claim in August 2021 and provided instructions for appealing, including a promise that its appeals team would send a confirmation of receipt. Plaintiff contended that he mailed a timely appeal in January 2022 and a follow-up in July 2022. Unum denied ever receiving either letter. In December 2023, Plaintiff sent copies of the 2022 letters by Priority mail, and Unum responded that the appeal window had long since closed. Plaintiff then sued under ERISA Section 502(a)(1)(B).

Did the plan require Plaintiff to exhaust before suing?

Yes. The plan’s summary plan description stated that, absent special circumstances, the administrative appeal process “must be completed before you begin any legal action regarding your claim.” Plaintiff argued that the summary plan description was not part of the binding plan, but the court disagreed. Relying on Aschermann v. Aetna Life Insurance Co. and CIGNA Corp. v. Amara, the court explained that a summary plan description can be incorporated into the plan by its own terms, and here it expressly was. The court also emphasized the strong federal policy favoring exhaustion, and found neither recognized exception, lack of meaningful access or futility, applicable. Plaintiff had been given explicit appeal instructions and never argued that an appeal would have been certainly denied.

Why did the mailbox rule not save the claim?

The dispute reduced to the mailbox rule, the federal common law presumption that a properly directed and mailed letter is received. Sitting as finder of fact on a Rule 52(c) motion, Judge Kness found Plaintiff’s evidence of mailing not credible. Plaintiff produced no witnesses, no electronic copies of either letter, and no delivery tracking, having sent both by ordinary First-Class mail. The envelope he offered for the January 2022 letter was unstamped, unpostmarked, and incorrectly addressed. The court found it significant that Plaintiff, a sophisticated former restructuring lawyer, used Priority mail for his later December 2023 letter but not for the earlier appeal letters he claimed were critical, and that he never followed up despite receiving no confirmation of receipt. On these findings, the mailbox presumption never arose.

Would the outcome change even if the presumption applied?

No. The court held that even if Plaintiff had established the presumption, Unum rebutted it with robust evidence of nonreceipt. Unum’s mailroom supervisor testified in detail about its receiving, sorting, and storage procedures, its quality-control audits, and its practice of retaining digital mail records for at least seven years. A search of both the digital records and the mail provider’s physical facility turned up neither letter. The court found this sufficient to conclude the letters were never received, and noted the evidence would satisfy even the more demanding rebuttal standard the Ninth Circuit applied in Schikore v. Bank America Supplemental Retirement Plan, though that standard does not bind the Seventh Circuit.

What does this ERISA decision mean going forward?

The holding is procedural, not a merits ruling on Plaintiff’s disability. But the practical lesson for ERISA claimants is concrete: an appeal is only as good as the proof that it was timely sent. Claimants who rely on ordinary mail, keep no copies, and do not follow up when no confirmation arrives risk losing the right to any judicial review, regardless of the strength of the underlying claim. Trackable mail, retained copies, and prompt follow-up on missing confirmations are not formalities. They can be the difference between a claim heard on the merits and one dismissed at the threshold.