Sources
Everything mailcheck asks, and what each one is. Our server asks them all; your browser never contacts them. Each one is told only the address or domain being checked.
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Services
IP blocklists
Good-sender lists
Domain blocklists
Threat feeds
Downloaded by our server on each feed's own schedule and kept in memory, so a lookup asks nobody.
Retired lists
Lists that have shut down. They are never asked.
Names and logos belong to their owners and are shown only to say where an answer came from.