Free outbound asset · ZIP + script
Check your sending domains before the first cold email. Free.
I blamed Mimecast for my bounces. The real problem: two pre-aged sending domains were on the SURBL abuse list, while their warmup dashboards showed 100%. This script checks every domain you send from in about 30 seconds, and it tells you when your resolver is blocked, so a refused lookup never shows up as "clean".
01
Spamhaus DBL, SURBL and URIBL, each tested with its official test record first.
02
SPF, DKIM and DMARC, mail provider, and where the domain's website redirects.
03
Domain age, plus a plain verdict per domain: ok to send, fix auth, or do not send.
ZIP + SCRIPT
Domain Blacklist Check
Enter your details and the download link goes to your inbox.
What's inside
Run it before you send another email.
In the ZIP
- domain_blacklist_check.py
- Setup guide + why your laptop gives fake-clean results
- 7-step pre-send checklist
What you get back
- Blacklist status on 3 lists
- SPF, DKIM, DMARC, redirects, age
- A send / don't send verdict