You have an offer for all your clients. You open Outlook, put a hundred addresses in BCC, and hit send.
Half of them never arrive. Some clients complain. By the third time, your domain is on a blacklist and even your ordinary emails stop getting through.
Why BCC doesn’t work
Spam filters look at three things: how many recipients a message has, whether there is a way to unsubscribe, and whether the domain has a history of sending like this.
A hundred addresses at once, no unsubscribe link, from a domain that usually sends five emails a day — that is exactly the pattern they use to recognise spam.
What works instead
A mailing tool. Mailchimp, Brevo, MailerLite — all of them have a free plan for up to a few thousand addresses. They send through servers with a good reputation, add an unsubscribe link automatically, and tell you who opened the email.
Or your own CRM, if it has a campaigns module — with the same rules.
Three rules without which nothing helps
1. An unsubscribe link in every email. It isn’t a courtesy — it is a legal requirement, and filters look for it. An email without one is suspicious by definition.
2. Send only to people who agreed to it. A bought list isn’t a list — it is a guarantee of spam complaints. And one complaint per thousand recipients is enough to cause trouble.
3. Warm up your domain. If you have been sending ten emails a day, don’t send a thousand tomorrow. Start with a hundred, then two hundred. A sudden jump looks like a compromised account.
A check before every send
- Does the domain have SPF, DKIM and DMARC
- Is there an unsubscribe link, and does it work
- Is the “from” address real, and does it accept replies
- Send it to yourself first — in Gmail, in Outlook and on a phone
If you are already on a blacklist
Check at mxtoolbox.com/blacklists.aspx. Most lists have a removal form — but fix the cause first, or you will be back on the list within a week.
All our plans include unlimited email addresses, with SPF and DKIM set up.
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