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1. The problem: why emails from a new domain end up in spam
Picture months of work organizing a corporate event. Every detail is set, from the venue to the speakers. You built a dedicated website and registered a new web address (technically called a "domain", e.g. corporate-event-2026.com). The moment comes to send invitations to thousands of attendees, and with one click you launch the send.
Days go by and registrations barely trickle in. A quick check reveals the bitter truth: most of your emails never reached anyone's inbox — they went straight to the spam folder.
The reason is simple: every major mailbox provider (Gmail, Outlook, Yahoo) runs automatic systems built to protect people from scams and unwanted mail. A web address registered just days ago that suddenly starts sending a huge number of emails looks exactly like typical spammer behavior. These systems have no way of knowing whether you're trustworthy, because they don't know you yet — so, to be safe, they treat you as suspicious by default. And in 2026, that initial suspicion carries more weight than it used to.
The problem gets worse when, for internal security reasons, your client can't authorize your sending platform to send on their behalf. In that case you're on your own, with an unknown web address and no track record at all.
2. Why a domain's "track record" matters so much
Mailbox providers give every domain (the web address you send from, like yourcompany.com) an internal trust score, based on how it has behaved over time. The higher that score, the more likely your emails are to actually land in the inbox instead of spam. That score isn't built in a day — it's the result of consistently good behavior over time.
According to historical analysis from Validity (the company that today includes what used to be known as Return Path), the single most common reason an email fails to arrive is still poor sender reputation. A new domain, by definition, has no track record yet — neither good nor bad. Faced with that uncertainty, spam filters would rather be too cautious than too permissive. That's exactly why two free tools, Google Postmaster Tools and Microsoft SNDS, are the first place to check how your domain is being seen — from your very first sends, not just once everything is already up and running.
3. What Gmail, Outlook and the rest check before delivering your email
To fix the problem, it helps to know what spam filters actually look at before deciding whether to deliver one of your emails.
3.1 Your email's three "ID documents": SPF, DKIM, DMARC
These three technical acronyms can sound intimidating, but the idea behind them is simple: they're systems that prove to mailbox providers you're genuinely authorized to send email on behalf of your domain — a bit like an ID card for your mail.
- SPF: a list of "who's allowed to send email" on behalf of your domain, recorded in your website's technical settings.
- DKIM: adds an invisible digital "signature" to every email, which the receiving mailbox can check to make sure the message hasn't been tampered with.
- DMARC: the rule that tells mailbox providers what to do when an email fails the SPF or DKIM checks (block it? send it to spam? let it through?), and also sends you useful reports on who's using your domain to send mail.
Setting these three up correctly is the first, non-optional step toward building trust with mailbox providers. Whoever manages your website or technical infrastructure can set them up for you. For a full walkthrough of how to tighten DMARC step by step — from "monitor only" mode all the way to actually blocking bad email — see our dedicated guide on the 2026 rules for high-volume senders.
3.2 How many emails you can send, and how fast
Jumping from zero to thousands of emails in a single day, from a brand-new domain, is a massive red flag for spam filters. Normal behavior looks like a gradual increase over time. The latest industry guidance says that, in today's climate, getting a truly new domain "used to" can take 4 to 8 weeks, compared to the 3-4 weeks that used to be enough a couple of years ago: filters have gotten stricter precisely because of the newer, tighter rules for high-volume senders.
3.3 How people behave when they get your emails
Mailbox providers also watch how recipients react to your messages.
- Opens and clicks: if lots of people open and click, that signals the content is useful and expected.
- Replies: since 2025, Microsoft explicitly recommends using sender addresses people can actually reply to — getting replies is becoming a genuine trust signal, not just good manners.
- Spam reports: every time someone marks your email as unwanted, your reputation takes a real hit — staying under 0.3% of reports is now a hard requirement, not just good advice.
- Addresses that no longer exist: emailing addresses that are wrong or no longer active (called "hard bounces") damages your reputation. That's why it's important to keep a clean, up-to-date contact list, including with the help of dedicated services like NeverBounce or ZeroBounce, which automatically check whether an address really exists before you send.
4. Practical ways to stay out of spam
Now that we understand "why", let's look at concrete solutions. If your new domain is starting at a disadvantage, you need a backup plan.
4.1 Lean on your client's web address
This is often the simplest, fastest solution. Your client's company domain (e.g. companyname.com) has probably been around for years, already has a good reputation, and is used daily to send legitimate email. You have two main options:
- Direct sending by the client: the client sends the communications for you, using their own internal systems. This gets the best results.
- A dedicated mailbox on the client's systems: the client creates an event-specific mailbox for you (e.g.
event2026@companyname.com), which you can connect to your event management platform. In this case, the client's IT team needs to authorize your platform to send on their behalf, by adding it to the domain's technical settings.
A real-world example: agency "Events Pro" is running a product launch for the company "Tech Corp". Instead of using a new domain like product-launch.com, it asks Tech Corp to create the address product-launch@techcorp.com. Tech Corp's IT team authorizes Events Pro's sending platform to use it. The result: emails go out "wearing" Tech Corp's solid reputation, and reach their destination far more often than a brand-new domain ever could.
4.2 Use your own agency's domain
If involving the client's IT team is too complicated, you can use your own agency's domain instead. If your agency has been around for years, your domain (e.g. agencyname.com) likely already has a good reputation. You can create an event-specific address, like events.agencyname.com (technically called a "subdomain"): it partly inherits the main domain's good reputation, but not entirely — so if you're expecting high volumes, it's still worth easing in carefully at first.
One tip: use a clear sender address, such as client-event@events.agencyname.com, and mention in the email text that you're writing on the client's behalf. Being transparent is always appreciated, both by spam filters and by the people receiving the email.
4.3 Gradually "warm up" the new domain
If you truly have no choice but to use the new domain, the only path is to increase the number of emails you send a little at a time, over several weeks, to build trust before the big send. The reference plan is the one shown at the top of this article: for the first two weeks you send small volumes, only to people who already know you; in week three you gradually double the volume while watching the results closely; and between weeks four and six you reach full volume — allowing more time if the signals (spam reports, non-existent addresses, how people engage) aren't fully positive yet.
This process takes time, and it isn't always compatible with events on a tight deadline. That's why solutions 4.1 and 4.2 are generally the better choice when they're available.
5. Why even a good reputation isn't enough anymore in 2026
A detail that's often overlooked: even a domain with an excellent reputation isn't enough on its own anymore. Since 2024, Gmail and Yahoo — and since 2025, Microsoft too — have introduced mandatory technical requirements for anyone sending lots of email at once (roughly above 5,000 a day), no matter how good the domain's track record is: correctly configured SPF/DKIM/DMARC authentication, a simple, one-click way to unsubscribe (no hunting for a hidden link at the bottom of the email) for promotional communications, and a spam-report rate under 0.3%. Senders who don't meet these requirements risk having their message rejected outright — not just sent to spam, but not delivered at all.
In practice: domain reputation decides how much your emails get rewarded by filters, but these new technical requirements decide whether they get accepted in the first place. A ten-year-old company domain without one-click unsubscribe can be blocked today just as easily as a domain registered yesterday. For the full guide, including a dedicated checklist, see our article on email anti-spam for events: the new Gmail, Yahoo and Microsoft rules.
6. Frequently asked questions
How long does it really take to get a new domain "used to" sending in 2026?
The latest guidance points to 4-8 weeks for a truly new domain, compared to the 3-4 weeks that used to be enough a couple of years ago. For an event on a tight deadline, this is usually the main reason to lean on the client's or agency's domain instead (see 4.1 and 4.2) rather than waiting that long.
Should I always use the client's address instead of a new one?
In most cases, yes, if you can coordinate with the client's IT team: it's the fastest route to good results. It isn't always possible, though — internal security rules, slow IT response times, or the need for an independent brand can make things complicated. In those cases, your agency's own domain, or a carefully planned warm-up started well in advance, remain good alternatives.
Does a subdomain really inherit the main domain's good reputation?
Only partly. events.agencyname.com starts out ahead of a completely new domain, but it doesn't automatically inherit all the trust the main domain has built up. It still needs watching, and for large volumes it's still worth easing in carefully at the start.
What happens if I increase my email volume too fast?
Mailbox providers read a sudden jump in volume as typical spammer behavior, even if the content is entirely legitimate. The risk isn't just to the current campaign: a damaged reputation can take weeks to recover, and that affects the same domain's later communications too — including important ones like registration confirmations.
Are services like NeverBounce or ZeroBounce enough to fix the problem on their own?
No: they greatly reduce non-existent addresses (one of the biggest factors hurting reputation), but they don't replace authentication (SPF/DKIM/DMARC), a gradual increase in sending volume, or the quality of what you actually send. They're a valuable piece of the puzzle — meant to be used alongside the other practices in this article, not instead of them.
7. What to check before you hit send
| SPF, DKIM and DMARC correctly set up (check with whoever manages your website) | ✓ |
| Clean contact list: no addresses you already know are inactive or non-existent | ✓ |
| Clear subject line, no excessive CAPS or words that read as aggressive advertising | ✓ |
| Content that's useful and relevant to the recipient | ✓ |
| Clearly visible unsubscribe link in the email body | ✓ |
| One-click unsubscribe system active for promotional emails | ✓ |
| Spam-report rate checked (via Google Postmaster Tools), under 0.3% | ✓ |
| Email tested across several inboxes (Gmail, Outlook, etc.) before the mass send | ✓ |
| Considered using the client's or agency's domain instead of a new one | ○ |
Event communications shouldn't be left to chance. Avoiding spam when starting from a new domain takes a clear approach: lean on domains that already have a good reputation when you can, or build one patiently through a gradual increase in sending — knowing that, in 2026, even a flawless domain still has to meet the new mandatory technical rules for anyone sending lots of email at once.
