# Casino Email Marketing: Rules, Deliverability, Measurement

Casino and sportsbook email marketing for operators: consent, unsubscribe, Gmail and Yahoo sender requirements, lifecycle emails, control-group tests.

Casino email marketing is the set of emails an operator sends to registered players to move them to the next step: a first deposit, a second deposit, a return after a break. It works when four things are in place: valid consent, a suppression list that is always current, a sender setup that passes Gmail and Yahoo checks, and a test against a control group that shows what the emails added.

Email is the cheapest channel in the CRM mix, so it is also the channel most often over-used. This guide sets out the rules, the technical minimum, the lifecycle emails to build and the way to measure them. It covers email and CRM messaging for operators only. Players who cannot or should not be contacted are handled as a rule, not as an exception.

## Which consent and unsubscribe practices apply

Three things apply at once: the consent each player gave, the sender requirements of the mailbox providers, and the operator's own suppression rules.

- Consent is stored per channel and per product. A player who accepts casino email may refuse betting email, and every preference is off until the player switches it on.
- Every message carries a working unsubscribe, and a withdrawal takes effect before the next scheduled send.
- Self-excluded players leave the marketing list as soon as the notification arrives. The same applies to players whose exclusion has expired but who have not chosen to return.
- Affiliates and partners that send for the operator use the same suppression list.
- An offer states all its conditions in the same message.

## Build the programme in six steps

## 1. Fix consent and preferences

Consent is a data record, not a checkbox on a form. Store for each player: the channel, the product, the wording shown, the timestamp and the source page. Without that record the operator cannot show what the player agreed to.

Build the preference centre around product and channel from the start. A player who accepts casino email and refuses sports email must be filtered at the segment level, not at the template level. Do not map a single legacy "marketing yes" flag onto every product.



- Consent record holds channel, product, wording, timestamp and source.
- Every email carries a working unsubscribe and a link to the preference centre.
- Withdrawal takes effect before the next scheduled send.
- Consent collected by affiliates or partners is not reused unless the operator holds the evidence.



## 2. Suppress players who must not be contacted

Suppression runs before segmentation. The list contains self-excluded players, players in a cooling-off period, players who withdrew consent, players who unsubscribed and players blocked by the safer gambling team. A segment is built only from players who are not on that list.

Make the suppression a single table that every send job reads at send time. A list exported on Monday and used on Thursday misses anyone who excluded on Tuesday. Test it with a seeded record: add a test player to the suppression table and confirm the next send skips that player.

Players with markers of harm are not a target for promotional email. The responsible gambling team owns that rule. The article on [responsible gambling in CRM](/blog/responsible-gambling-crm/) describes how the CRM team and the safer gambling team split the work.

## 3. Pass the Gmail and Yahoo checks

Gmail and Yahoo publish their requirements. Both treat marketing mail from a sender with weak authentication or a high complaint rate as a problem.

Gmail applies its bulk-sender rules to senders that send about 5,000 messages or more to personal Gmail accounts in 24 hours. Once a sender is classed as bulk, the status is permanent. Gmail requires:

- SPF and DKIM both passing.
- A DMARC record with a policy of at least p=none, with the From domain aligned to the SPF or DKIM domain.
- TLS on the connection and valid forward and reverse DNS for the sending IP.
- One-click unsubscribe for marketing messages, implemented with List-Unsubscribe headers per RFC 8058 and an HTTPS URL. A link in the body does not satisfy this.
- Google recommends honouring unsubscribe requests within 48 hours.

Yahoo asks bulk senders for SPF and DKIM and a DMARC policy of at least p=none that passes. It also asks for a working List-Unsubscribe header with one-click support, a visible unsubscribe link in the body and unsubscribes honoured within two days.

**Spam complaint rate limits**

- Gmail: keep below: 0.1%
- Gmail: never reach: 0.3%
- Yahoo: keep below: 0.3%

Read the complaint rate in Google Postmaster Tools every day. Gmail calculates it daily. Above 0.3%, a sender loses eligibility for mitigation, and it returns after seven consecutive days below 0.3%. Yahoo calculates its rate from mail delivered to the inbox.

Use a separate sending subdomain for marketing so that a complaint spike does not damage transactional mail such as withdrawal confirmations.

## 4. Build the lifecycle email set

Build email around the points where a player stops one step short of value. Gamble Grip's Lifecycle Loss Map names seven of them: welcome, onboarding, first deposit, second deposit, reactivation, retention and event. The [player lifecycle management](/blog/player-lifecycle-management/) guide describes each stage. For email, five do most of the work.

| Stage | Trigger | Email job | Stop rule |
|---|---|---|---|
| Onboarding | Registered, no deposit after 24 hours | Explain the next step and the payment options. | Stop after the first deposit. |
| First deposit | Deposit started, not completed | Remove the friction that caused the drop. | Stop after completion or one reminder. |
| Second deposit | First deposit made, no repeat in 7 days | Show what the player can do next. | Stop after the second deposit. |
| Reactivation | No activity for the agreed dormancy window | Return invitation, one clear reason. | Stop at a fixed number of touches. |
| Event | Fixture or release the player has interacted with before | Time-limited information, no pressure. | Stop at event end. |

Transactional emails (verification, withdrawals, limit changes) are not marketing. Keep them out of the marketing template, the marketing sending domain and the marketing send counts.

Any bonus in an email carries its conditions in the same email. Show the conditions when the offer is first presented.

## 5. Set touch rules

A touch rule says how many emails a player can receive in a period and in what order. Without it, every automation fires on its own and one player receives four emails in a day.

**Reactivation touch sequence, email first**

- Day 0: Return invitation. One email, one reason, no bonus.
- Day 4: Second email. Only to players who did not open the first and have email consent.
- Day 10: Final email. Short and factual, then the player leaves the sequence.
- Any time: Stop. Immediately on complaint, unsubscribe, exclusion or a safer gambling flag.

Set a global cap across all journeys, for example no more than two marketing emails in seven days per player, and let a priority order decide which message wins. Cap by player, not by campaign.

Channels beyond email need their own consent under the per-channel rule. A player who opted into email is not opted into SMS or voice. The [player reactivation campaigns](/blog/player-reactivation-campaigns/) guide covers how channels are ordered across a reactivation.

## 6. Measure against a control group

Open rate and click rate describe activity. They do not show whether the email produced a deposit that would not have happened anyway. The test is a randomly selected control group that receives no email in the period.



Take the eligible audience after suppression. Split it at random, for example 80% treated and 20% control. Send to the treated group only. Compare both groups on deposit rate and NGR per player over the same window, such as 14 or 30 days. Define the window before the send, not after.



- **Incremental depositors** = (treated deposit rate − control deposit rate) × treated players
- **Incremental NGR** = (treated NGR per player − control NGR per player) × treated players





**Example.** An audience of 25,000 players is split 20,000 treated and 5,000 control. After 30 days, 1,800 treated players deposited (9%) and 350 control players deposited (7%). The difference is 2 points. On 20,000 treated players that is 400 depositors caused by the programme. The other 1,400 deposits would have happened without it.



**Depositor rate, treated against control**

- Treated group: 9%
- Control group: 7%
- Caused by the programme: 2%

Compare the incremental NGR with the full cost: the email platform, the bonus cost and the CRM team time. The glossary entry on [incremental lift](/glossary/incremental-lift/) defines the measure, and the [campaign economics calculator](/tools/campaign-economics-calculator/) models cohort NGR and payback. Keep the control group out of every other campaign that targets the same outcome during the test.

## What to review each month

Review five numbers: the complaint rate, the unsubscribe rate per send, the share of the base with valid consent per product and channel, the suppression-failure count (sends to a player who should have been suppressed, target zero) and the incremental result of each lifecycle journey. A rising unsubscribe rate in one journey points to a frequency or relevance problem in that journey. A suppression failure is an incident, not a metric to trend.

## FAQ

### Do casino operators need consent to send marketing emails?

Yes. Treat consent as required for every channel and product. Store its date, wording and source, offer a way to withdraw in every message, and stop sending as soon as a player withdraws.

### How fast must an unsubscribe be honoured?

Gmail asks bulk senders to honour unsubscribes within 48 hours, and Yahoo requires 2 days. A self-excluded player leaves the marketing list as soon as the notification arrives. Build the suppression process to the shortest of these.

### What spam complaint rate is safe?

Gmail tells senders to keep the user-reported spam rate below 0.1% and never reach 0.3%. Yahoo asks senders to stay below 0.3%. Read the rate in Google Postmaster Tools daily and treat 0.1% as the working limit.

### Which lifecycle emails does a casino or sportsbook need first?

Start with the stages where a player stops one step short of value: registration without a deposit, first deposit without a second, and dormant players. Each of these has a clear trigger, a clear audience and a clear outcome to measure. Event and retention emails come after those three work.

### How do you prove an email programme works?

Hold back a randomly selected control group that receives no email, send the campaign to the rest, and compare both groups on deposits and NGR over the same period. The difference is the effect caused by the programme. Open and click rates do not show this.

### Can the same email go to every player in a segment?

No. Players who have self-excluded, withdrawn consent or opted out of the email channel must be removed first. Players flagged by safer gambling or VIP risk checks need a separate rule set, owned by the responsible gambling team, before any promotional email is planned.