Giving each trial signup a separate forwarding alias defines email protection for free trials. Marketing sent after the trial ends then goes to that separate address, not to the main inbox. Signup produces a billing record and a marketing record. The billing record converts to a paid subscription unless cancellation occurs before the trial end date. The marketing record can persist after the trial ends, even for an account no longer in active use. A distinct alias for each trial keeps that marketing stream separate from other accounts. Recovery, billing and cancellation messages still arrive, because the alias remains in use until the trial account itself is closed.
| Record created at signup | Behaviour after the trial ends |
|---|---|
| Billing record | Continues as a paid subscription unless cancelled before the trial end date |
| Marketing record | Can continue after the trial ends even when the trial account is no longer used |
Free trial structure
A free trial is a limited period of access at no charge or at a nominal charge, followed by paid access unless the account holder cancels. The Federal Trade Commission describes negative option marketing as an arrangement in which silence is treated as permission to charge, and the FTC gives the free trial that converts to monthly shipments as its example. The same FTC guidance states that a card number is usually required for a free trial so the company can charge the account holder when cancellation does not happen before the trial ends, and that dishonest businesses make cancellation difficult and keep charging after the account holder has tried to stop. Cleeng reports typical direct to consumer trial lengths of between 7 and 30 days, with shorter trials of 3 days and longer trials of up to 60 days also in use.
Trial marketing
Messages sent after signup for promotional purposes form trial marketing, a category separate from service messages covering password resets and billing notices. Expiry reminders, upgrade offers, discount offers, win-back offers following cancellation, and promotions for related products all fall within this category. Cleeng characterises the address collected at signup as a permission based marketing database, available for later promotional offers and win-back campaigns even where the trial user never converts.
Marketing consent
Marketing consent is the legal basis on which later messages are sent. In the United Kingdom, the Information Commissioner's Office states in its electronic mail marketing guidance that consent must be a clear affirmative action, and that pre-ticked opt-in boxes, silence, or inactivity are not consent. The same guidance sets out the products and services soft opt-in, which allows marketing of similar products without fresh consent when the contact details were obtained during a sale or negotiations for a sale, when only similar products are marketed, and when an opt-out was offered at collection and in every later message. The guidance gives signing up to a free trial as an example of negotiations for a sale, so trial signup alone can open a lawful route to later marketing of similar products under that framework, subject to the opt-out conditions. The ICO lawful basis table for electronic mail marketing lists consent or soft opt-in as the requirement for electronic mail marketing to individual subscribers. Trial marketing after a trial ends is therefore not always unlawful, because the address may remain on a list used for a different campaign at a later date.
Cancellation regulation
On 16 October 2024, the FTC finalised an amended Negative Option Rule that would have required clear disclosure of material terms before billing information was collected, separate express consent for the negative option feature, and a simple cancellation mechanism through the same medium used for signup. Sidley Austin summarised the final 2024 rule and its requirements at the time, including the rule that cancellation had to be at least as easy as the signup process. On 8 July 2025, the US Court of Appeals for the Eighth Circuit vacated that amended rule in its entirety on procedural grounds, without deciding the merits, and Steptoe summarised the vacatur and its procedural basis. The Restore Online Shoppers Confidence Act and state autorenewal laws continue to apply, but the uniform federal click-to-cancel standard proposed in 2024 is not in force.
Trial conversion
Trial conversion is the rate at which trial users become paying customers, and the rate varies sharply by trial model. A 2026 ChartMogul study of 200 software products, as reported by Pulseahead, put opt-in trial conversion at 8.9 percent and card-required trial conversion at 31.4 percent, with a median free to paid rate of 8 percent across the products studied. The Pulseahead summary of the study also notes that card-required trials attract fewer signups but convert a higher share of those signups. A separate summary reports the same median rate and card-required figure, with 14 days as the most common trial length cited. The figures are reported vendor study results, not a universal law of trial behaviour, and they vary by industry, product complexity, and traffic source. A large share of trial users do not convert, and those non-converting users are the group whose addresses remain available for later marketing after the trial ends, because conversion is not required for an address to stay on a marketing list.
Address sharing and data brokers
A signup address can travel beyond the provider that collected it, and the data broker market is one route by which an address gains a wider audience. The mechanism is matching against other data about the same person, and the matched profile can then be used for targeting. The FTC case against Kochava, as reported in January 2024, concerned a company that the FTC alleged collected consumer data without notice or consent, analysed that data, and sold data linking precise location data with email, demographics, devices, households, and channels. The report on the Kochava case states that the FTC alleged Kochava customers could obtain name, home address, email address, economic status, and stability for people in selected audience segments, and that the data was purchased by advertisers, insurers, and political campaigns. Kochava denied the FTC allegations, and the case was in discovery at the time of the report, so the allegations are reported claims rather than established findings. No claim is made here that any named trial provider sold a specific trial address to Kochava or to any other named broker, because no such provider-specific evidence was verified in the research for this article.
Breach exposure
A provider breach also exposes any trial address stored by that provider, and the scale of the exposure depends on how widely the address is used. Where the address is the main inbox address for many accounts, the exposure extends across all of those accounts. Have I Been Pwned operates as a breach search service, holding a database of known breaches that the service describes as aggregating tens of billions of breached records. The Have I Been Pwned service lists the breaches containing a given address, along with the data types exposed in each breach, which allows a trial address found in a breach to be traced back to the provider holding it. A breach involving a main inbox address therefore affects every account sharing that address. A breach involving a trial alias, by contrast, remains confined to the single trial account that used the alias, since no other account uses that address.
Alias separation
Under alias separation, every trial receives its own forwarding address. Messages for that trial then reach the main inbox through an address that is distinct, identifiable, and capable of being filtered or disabled independently of other accounts. Forwarding provides the mechanism: mail addressed to the alias is delivered to the main inbox, while replies go out from the alias, so the trial provider never sees the main address. Apple describes Hide My Email as a source of unique random addresses that forward to a personal account, with replies appearing from the alias address and with addresses that can be deactivated or deleted. Apple also describes setup and management of Hide My Email across iPhone, iPad, Mac, and iCloud.com. Proton describes the same forwarding mechanism in its hide-my-email alias documentation, stating that a sender writes to the alias, Proton forwards the message to the mailbox, and a reply to a forwarded message is sent from the alias, with up to 10 aliases on Proton Free and Mail Plus. The common feature across those systems is that the alias is a persistent forwarding identity for the account, and that persistence is what makes the method compatible with account recovery and cancellation. Sharing one alias across several trials removes that separation, because messages from one trial cannot then be separated from messages from another trial. An alias does not hide payment details, device information, or browsing behaviour from the trial provider, and a provider that collects those signals can still build a profile from data other than the email address. An alias does not prevent marketing to a different address given the same provider in another context, or marketing through channels other than email, and it does not help when a signup form rejects addresses from known alias or relay domains.
Plus addresses and limits
Plus addresses offer a simpler form of separation, but their limits explain why a random forwarding alias serves trials better. With a plus address, a tag follows a plus sign inside the main address. Messages to the tagged address still arrive in the main inbox, and the tag itself identifies the trial that sent the message. Canary Mail explains in its guide to email aliases that plus addresses and dots in a Gmail address do not hide the main address, because the tag can be stripped to recover the main address, and that some signup forms reject addresses containing a plus sign. The same guide notes that a plus address shares the security of the main account. A trial provider that receives a plus address also receives the main address in plain form, so the provider can strip the tag, link the trial to other data about the same address, and continue marketing to the main address after the alias is filtered. A random forwarding alias does not contain the main address, so stripping a tag is not possible, and disabling the alias stops delivery without changing the main address itself.
Account recovery and cancellation
Two functions depend on an alias remaining active until the trial account itself is closed: account recovery and cancellation. The address on the account receives recovery messages, billing notices and cancellation confirmations, so disabling the alias early severs the channel carrying those messages. Activity must therefore continue for the full life of the trial account, including the interval after cancellation during which a confirmation or a final billing notice may still be sent. The method is not a route to repeat free trials, to multiple accounts for one trial, or to an address that stops working during the trial.
Cancellation cannot be replaced by disabling an alias. Subscription and billing records stay active at the provider even after messages to the alias stop arriving, and charges can continue under the terms agreed at signup. The required order is provider cancellation first, receipt of the cancellation confirmation through the alias second, and disabling of the alias only once the account is confirmed closed. A trial that converts to a paid subscription and is later cancelled follows the same order, since the paid account keeps using the same address until the account holder changes the address on the account or closes the account.
Managed aliases for trial signups
AliasFleet is an email alias and forwarding service that provides a separate forwarding address for each website or service, with mail to that address delivered to a verified destination inbox. The AliasFleet homepage describes the free plan as 10 active forwarding privacy aliases, 3 auto-provisioned personal subdomains, 1 verified destination inbox, and 100 MB monthly forwarding bandwidth, with two-way reply forwarding through the inbox. For trials, AliasFleet supplies one alias per trial and forwards trial messages to the destination inbox. Once the trial account is closed, the alias can be disabled, after which later marketing to that alias no longer arrives. AliasFleet does not cancel trial subscriptions, alter trial terms, or prevent a provider from charging under terms agreed at signup, since cancellation and billing remain provider functions outside the forwarding service. Data already held by the provider is not deleted by disabling an alias, so the service restricts the flow of future messages rather than erasing the past record.
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