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If there is a delay getting the 220 banner then its likely you might have an invalid DNS name in your configuration causing a timeout.
- You might want to try disabling "Resolve permitted / blocked hostnames to IP addresses" in the "permitted and blocked senders" list under Email Configuration -> Receiving Email -> Permit and Deny Lists.
- You can also disable "Resolve the above names to IP addresses" under Email Configuration -> Receiving Email -> Anti-Relay Settings.