Hi, i tried both solutions but nothing worked.when I mentioned upgrading the smtp.php file, I mean the "update pear package" as you mentioned as well.changing the 5.1.0 to 6.1.0, is there a code into SMTP.php file where do a version checker, so a read sometimes changing that line, works, but not with me.i'm still sucked.the weird here, this system has been operating almost 2.5 years, until Dec 1st.