如何在Server上設定，如果外部寄來的電郵超過限制的大小就拒收呢？你可以修改/etc/sendmail.cf：Mlocal, P=/bin/mail, F=lsDFMrmn, S=10, R=20/40, Maxsize=1000000, A=mail -d $u Mprog, P=/usr/local/sendmail/smrsh, F=lsDFMeu, S=10, R=20/40, D=$z:/, Maxsize=1000000, A=sh -c $u This limits incoming mail processed by by smrsh and /bin/mail to 1 million bytes. You can do the same with the Mstmp, Mesmtp, and Mrelay statements to limit the size of outgoing mail as well.