求助，高手帮忙看看日志, IMAIL无法对外发邮件问题

破碎水瓶

高手帮我看看这段日志，无法发邮件至外部邮件系统，却在邮件系统内部能收发，也能接收外部邮件。是什么原因产生的？<br>
20041126 080217 127.0.0.1 SMTPD (000902F8) [218.5.76.27] connect 218.5.76.27 port 3979<br>
20041126 080317 127.0.0.1 SMTPD (00450184) [218.5.76.27] connect 218.5.76.27 port 3984<br>
20041126 080418 127.0.0.1 SMTPD (004E0244) [218.5.76.27] connect 218.5.76.27 port 3990<br>
20041126 080518 127.0.0.1 SMTPD (004F0244) [218.5.76.27] connect 218.5.76.27 port 3994<br>
20041126 080618 127.0.0.1 SMTPD (00500244) [218.5.76.27] connect 218.5.76.27 port 3999<br>
20041126 080718 127.0.0.1 SMTPD (00510244) [218.5.76.27] connect 218.5.76.27 port 4005<br>
20041126 080816 127.0.0.1 SMTP (0840001F) processing D:\IMail\spool\Q3a7f161047c.GSC<br>
20041126 080816 127.0.0.1 SMTP (0840001F) Trying sohu.com (0)<br>
20041126 080817 127.0.0.1 SMTP (0840001F) Stack connect fail "61.135.150.215"<br>
20041126 080817 127.0.0.1 SMTP (0840001F) requeuing D:\IMail\spool\Q3a7f161047c.GSC R0 T1<br>
20041126 080817 127.0.0.1 SMTP (0840001F) finished D:\IMail\spool\Q3a7f161047c.GSC status=3<br>
20041126 080818 127.0.0.1 SMTPD (00530244) [218.5.76.27] connect 218.5.76.27 port 4017<br>
20041126 080919 127.0.0.1 SMTPD (00540244) [218.5.76.27] connect 218.5.76.27 port 4022<br>
20041126 081019 127.0.0.1 SMTPD (00550244) [218.5.76.27] connect 218.5.76.27 port 4027<br>
20041126 081112 127.0.0.1 SMTP (08400020) processing D:\IMail\spool\Q3aaa42c0818.GSC<br>
20041126 081112 127.0.0.1 SMTP (08400020) ldeliver sanan.cn silver-main (1) webmaster@sanan.cn 482<br>
20041126 081112 127.0.0.1 SMTP (08400020) finished D:\IMail\spool\Q3aaa42c0818.GSC status=1<br>