BlackList :


The blacklist check will test a mail server IP address against over 100 DNS based email blacklists. (Commonly called Realtime blacklist, DNSBL). If your mail server has been blacklisted, some email you send may not be delivered. Email blacklists are a common way of reducing spam. If you don't know your mail server's address, start with a Uptime360.

Command Explanation
blacklist Check IP or host for reputation
smtp Test mail server SMTP (port 25)
http Verify a URL allows http connections
https Verify a URL allows secure http connections
ping Perform a standard ICMP ping
icmp Perform a standard ICMP trace route
dns Check your DNS Servers for possible problems
Ftp check file transfer protocol
ssh check Server its authorized_keys file for the public key
rdp Check remote desktop protocol
pop3 Check default email server port is pop3
imap Check default email server port imap
tcp Verify an IP Address allows tcp connections
udp The UDP protocol works similarly to TCP, but it throws all the error-checking stuff out
dns lookup DNS lookup returns the hostname of an IP address

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