Tex. Bus. & Com. Code § 44.152
§ 44.152. Acknowledgment Required; Transmission Prohibited
On receipt of oral or written notification from a recipient of a facsimile solicitation not to send any
further facsimile transmissions to one or more telephone numbers specified by the recipient, the person making
the facsimile solicitation:
(1)
shall within 24 hours send the recipient a written acknowledgment of the recipient's notification; and
(2)
may not make or cause to be made a transmission to a telephone number specified by the recipient,
except for a single transmission to comply with Subdivision (1).