Every TREC-promulgated Texas residential contract runs on deadlines — option period, financing approval, title objections, closing. Every one of those deadlines can be shortened, waived, or blown entirely by a single question: did the notice actually go out in a way the contract recognizes? TREC Form 20-19's ¶ 21 (Notices) answers that question, and it changed meaningfully from the prior form. This guide walks through exactly how notice delivery works under the current contract, what counts as "delivered," and where agents and TCs get it wrong.
¶ 21's current text
TREC Form 20-19 (effective 07/01/2026) ¶ 21 reads: "All notices from one party or their agent to the other must be in writing. Notices are effective when mailed to, hand-delivered at, sent by overnight courier to, or transmitted by electronic transmission to the other party or their agent." Four methods, and a contact block for each: Buyer, Seller, Seller's agent, and Buyer's agent each get their own address/phone/email lines.
The method that disappeared: fax
Prior versions of the form (20-17, 20-18) listed fax as a valid delivery method alongside mail, hand delivery, and electronic transmission. 20-19 drops fax entirely and adds overnight courier as a named method instead. If your file still references faxing a notice under a current-form contract, that's not one of the methods the form text defines anymore — use mail, hand delivery, overnight courier, or electronic transmission (email or text, per how the parties filled in ¶ 21's contact blocks).
The nuance that matters most: effective when sent, not when received
Read ¶ 21 closely: notices are effective when mailed, hand-delivered, sent by courier, or transmitted electronically. Every verb describes an act of the sender, not an act of the recipient. Nothing in ¶ 21 says a notice has to be opened, read, or even seen to count — it says the notice is effective at the moment of dispatch. That's a real, operative difference from a "received" standard, and it cuts both ways: it protects the sender who dispatched on time even if the other side claims they never saw it, and it means a recipient can be legally on the clock for a notice they haven't yet opened.
How this interacts with the option period's 5:00 PM deadline
¶ 5B (Termination Option) requires the buyer's notice of termination to be given "by 5:00 p.m. (local time where the Property is located) by the date specified." ¶ 21 supplies the definition of what "given" means for that deadline: if the buyer's agent transmits the termination notice electronically at 4:58 PM on the last day of the option period, the notice is effective at that moment under ¶ 21 — it does not matter whether the seller or seller's agent opens the email at 4:59 PM or the next morning. Conversely, an unopened, unread notice sent one minute after 5:00 PM is late, full stop, regardless of when it's eventually seen. See our full option period breakdown for the rest of ¶ 5B's mechanics, and TREC 38-8 for the termination notice form itself.
Does email actually count without more?
Yes — but there's a statutory layer underneath the contract worth understanding, not just the form language. Texas's Uniform Electronic Transactions Act (Texas Business & Commerce Code Chapter 322) generally applies electronic-record rules only "between parties each of which has agreed to conduct transactions by electronic means," and that agreement is judged from context and conduct, not a separate signed consent form (Tex. Bus. & Com. Code § 322.005(b)). In practice, a party who fills in an email address on ¶ 21's contact block, and who has been transacting by email throughout the deal, has established exactly that context. Absent a contrary agreement, Chapter 322 also has its own default rules for when an electronic record is legally "sent" and "received" (§ 322.015) — but ¶ 21 is itself an agreement that varies those defaults for notices under this contract, which UETA expressly allows parties to do. The practical upshot: for TREC-contract notices, ¶ 21's "effective when sent" language controls, not a generic "did they receive and open it" standard.
What if a party never filled in an email address?
¶ 21's contact blocks are blank lines — Buyer, Seller, Seller's agent, and Buyer's agent each get their own Address/Phone/Email fields, and nothing requires all of them to be completed. If a party's line was left blank for a given method, sending a notice to that unlisted channel is a weaker position if delivery is ever disputed. Flag incomplete ¶ 21 blocks before execution — it's a two-minute fix at contract signing and a real headache during a disputed termination.
Practical checklist for agents and TCs
- Confirm ¶ 21's contact blocks are fully filled in for both parties and both agents before the contract goes effective — especially email, since that's the fastest and most commonly disputed method.
- Send time-sensitive notices (option termination, financing termination, title objection) through a channel that timestamps automatically — email with a sent-timestamp, or a platform that logs delivery. A text message to a personal cell phone is harder to prove later than an email thread.
- Don't wait for a read receipt or a reply to consider the deadline met. Under ¶ 21, sending on time is what matters. But for your own file documentation, save the sent confirmation (and any bounce-back or read receipt you do get) regardless.
- For true deadline-day notices, consider redundancy — email and a phone call, or email and hand delivery. ¶ 21 doesn't require it, but a disputed "I never got it" claim is far weaker against two independent delivery methods.
- Remember ¶ 21 governs the contract's own notices — not every statutory notice in a Texas real estate transaction. HOA resale/foreclosure notices, RCLA construction-defect notices, and other statutory notices often carry their own service requirements set by statute, not by ¶ 21. Check the specific statute or form governing that notice.