Sendmail in SuSE 7.3

I just installed an email server using sendmail 8.11 in SuSE 7.3. I think I have to tune something but I don't know where. The problem is I cannot use SMTP port to send the email, I still use provider SMTP. I test with telnet and the POP3 and SMTP port are OK. Beside that I see that the date is wrong, someone send me an email this day but the date in my Outlook is tomorrow Can somebody help me with this problem? Kind Regards, M. Edwin