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Blacklists

Unwanted mail
never gets through

Add a sender to the blacklist — and every one of their emails will be rejected at the connection stage, without ever reaching quarantine.

How it works

Blocking at the
SMTP session level

The blacklist is checked as soon as a sender connects to the server. Blocked addresses are rejected before the message is even transferred. This saves resources and leaves no chance of delivery.

  • Blocked before the message body is transferred — saves bandwidth
  • The sender gets a standard SMTP rejection (code 550)
  • Messages never reach quarantine — they're rejected outright
  • Works independently of the anti-spam filter's score
Blacklist
🚫
spam-domain.com
Mass mailing
Always block
🚫
casino-win.bet
Online casino
Always block
🚫
noreply@promo-bulk.net
Unwanted advertising
Always block
🚫
phish@fake-bigbank.com
Phishing emails
Always block
Messages are rejected at the SMTP stage with code 550 — before the body is transferred
What blacklists can do

Flexible blocking

🌐
By domain
Block an entire domain outright. Not a single email from @spam-domain.com will get through.
✉️
By address
Precisely block a single address without affecting other senders on the same domain.
🎭
Masks and wildcards
Patterns like *@*.casino-*.com or promo-*@* — cover entire groups of unwanted addresses.
👤
Per-mailbox
Blacklist a sender for a single mailbox only, without affecting anyone else.
⚡
Instant effect
Add an entry and the very next email from that sender will already be blocked.
📋
Bulk import
Upload a ready-made block list through the API or the control panel — thousands of entries at once.

Unwanted mail won't bother you again

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