Is there any command in unix to check a pop3 account using terminal? I mean, type the server/username/password of a pop3 account and see if the username/password is correct?
You can use
telnet to connect to the mail server and talk POP3 to check your credentials:
$ telnet pop.gmx.net 110 Trying 22.214.171.124... Connected to pop.gmx.net. Escape character is '^]'. +OK POP server ready H migmx028 0MAbjW-1YwF4D0ml8-00BiVl USER [email protected] +OK password required for user "[email protected]" PASS typeyourpassword -ERR Error retrieving your GMX emails. Your connection is not encrypted. Enable SSL in your mail program. Instructions: https://ssl.gmx.net Connection closed by foreign host.
Well, this failed because most mail server require a SSL/TLS encrypted session nowadays. So instead of using
telnet you can use
$ socat - OPENSSL:pop.gmx.net:995 +OK POP server ready H migmx113 0MC062-1Yzese0KO7-00AVNE USER [email protected] +OK password required for user "[email protected]" PASS typeyourpassword +OK mailbox "spamaccount8[email protected]" has 13518 messages (191718918 octets) H migmx113
If you type a wrong password, the server will probably say something like:
-ERR authentication failed
Or instead of
socat you probably have
openssl laying around:
$ openssl s_client -quiet -connect pop.gmx.net:995 depth=2 C = DE, O = Deutsche Telekom AG, OU = T-TeleSec Trust Center, CN = Deutsche Telekom Root CA 2 verify error:num=19:self signed certificate in certificate chain verify return:0 +OK POP server ready H migmx108 0MWpjO-1YiwnK3ZfP-00XoK