my friend ask me to help because he cannot send email from his company. i just have little knowledge about mail server so what i do:
dig mx hiscompany.name
then try to send using telnet with port 25 no answer.
telnet mx.hiscompany.name 25
then try to send using telnet with port 587
telnet mx.hiscompany.name 587
Connected to mx.hiscompany.name. Escape character is '^]'. +OK POP3 server ready <email@example.com>
so is this mean that there is misconfiguration somewhere or what. because that header is like telnet to pop3 port 110? i can use command user and pass just like telnet to pop3 port.
then i just run nmap hiscompany.name and i cant seem to find any smtp this is what scan return
110/tcp open pop3 |_pop3-capabilities: USER IMPLEMENTATION(Smartertools SmarterMail 1 5) UIDL APOP TOP OK(K Capability list follows) | banner: +OK POP3 server ready <firstname.lastname@example.org |_.c> 587/tcp open submission |_smtp-commands: SMTP: EHLO -ERR Invalid command | banner: +OK POP3 server ready <email@example.com |_.b>
please some one tell me that there is somehow problem with the server configuration or something because he said that his IT person say there is no problem with the server.
EDIT I ask my friend to try login using webmail instead of mail client like outlook he said he can send and receive when using webmail. ok so i really dont understand.