Jack.SQ: Monitoring Blacklists
I noticed you've had a few bad 1-star reviews lately.
And people mentioned blacklist blocking, including issues with Outlook.
This can be managed, but you need to have constant RBL monitoring, preferably every 1-hour.
A good solution for this is: RBLtracker.com
I saw that it also has some support for Outlook.com.
This should solve your problems if you monitor it and unsubscribe from BL quickly.
George_Dragit
Dec 11, 2025A: Hi Jack,
We had one customer who misused our platform in one of our shared IP pool. He was blocked almost instantly, but it impacted delivery rates to Microsoft servers for 4-5 days within that IP pool.
The IP pool was not blacklisted. Only Microsoft servers delayed and rate limited messages within this IP pool.
We do monitor all our IP pools and the only IP pool that is on the blacklists is our onboarding IP pool, which is almost impossible to delist as a lot of new customers (especially with LTD like this) try to send spam.
None of our high reputable IP pool is or was on blacklists.
As this is the nature of all shared IP pools, we do our best to minimize and we will improve our Back-Off mechanism and automatic throttling to minimize the impact on other customers when this happens in the future.
The question is, how and how quickly do you monitor it?
🤔
Live. We monitor live SMTP responses and IP reputation, so if anything happens, we see it instantly.