DOT Rule 49 CFR Part 40 Section 40.413
Subpart R - Public Interest Exclusions
§ 40.413 How are notices sent to service agents?
(a) If you are a service agent, DOT sends notices to you, including correction notices, notices of proposed exclusion, decision notices, and other notices, in any of the ways mentioned in paragraph (b) or (c) of this section.
(b) DOT may send a notice to you, your identified counsel, your agent for service of process, or any of your partners, officers, directors, owners, or joint venturers to the last known street address, fax number, or e-mail address. DOT deems the notice to have been received by you if sent to any of these persons.
(c) DOT considers notices to be received by you—
(1) When delivered, if DOT mails the notice to the last known street address, or five days after we send it if the letter is undeliverable;
(2) When sent, if DOT sends the notice by fax or five days after we send it if the fax is undeliverable; or
(3) When delivered, if DOT sends the notice by e-mail or five days after DOT sends it if the e-mail is undeliverable.