Warning:  OS detection will be MUCH less reliable because we did not find at least 1 open and 1 closed TCP port
Interesting ports on mail.ertonline.gr (195.170.27.248):
(The 1535 ports scanned but not shown below are in state: filtered)
Port       State       Service
21/tcp     open        ftp                     
25/tcp     open        smtp                    
80/tcp     open        http                    
110/tcp    open        pop-3                   
389/tcp    open        ldap                    
636/tcp    open        ldapssl                 
6667/tcp   open        irc                     

No exact OS matches for host (test conditions non-ideal).
TCP/IP fingerprint:
SInfo(V=2.54BETA22%P=i386-unknown-freebsd4.0%D=6/2%Time=3B19AC0A%O=21%C=-1)
TSeq(Class=TD%gcd=1%SI=7%IPID=RPI%TS=U)
TSeq(Class=TD%gcd=1%SI=4%IPID=RD%TS=U)
TSeq(Class=TD%gcd=1%SI=2%IPID=RD%TS=U)
T1(Resp=Y%DF=Y%W=2017%ACK=S++%Flags=AS%Ops=M)
T2(Resp=Y%DF=N%W=0%ACK=S%Flags=AR%Ops=)
T3(Resp=Y%DF=Y%W=2017%ACK=S++%Flags=AS%Ops=M)
T4(Resp=Y%DF=N%W=0%ACK=O%Flags=R%Ops=)
T5(Resp=N)
T6(Resp=N)
T7(Resp=N)
PU(Resp=N)




# Nmap run completed at Sat Jun  2 23:16:26 2001 -- 1 IP address (1 host up) scanned in 738 seconds