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Knowledge Base Home aero-right Delivery aero-right Is a major ISP blocking your emails?

Is a major ISP blocking your emails?

Delivery Updated on March 1, 2019


If a major ISP (like AOL, or MSN/Hotmail, Yahoo! or AOL) is blocking your emails, this is actually not that unusual. The major ISPs usually block emails temporarily and then remove the servers from the blacklist within a day or two. Please note that Benchmark is on so many feedback loops with major ISPs that we usually already know when this happens, and we re-route emails to other outgoing email servers until the issue is cleared up. We also investigate the user that caused the problem, and boot them if we feel they’re doing too much harm or violating our terms of use.

But if you happen to see a major ISP blocking Benchmark in your SMTP headers, it helps if you contact us immediately. We can then contact that ISP and work things out with them directly.