我对 Unix 和 CLI 一窍不通。在谷歌搜索近 6 个小时后，我开始知道我应该将 postfix 端口从 25 编辑到 587，以使 PHP mail() 函数正常工作。这是我得到的解决方案http://www.linuxmail.info/postfix-change-port/但我不确定如何更改它。如前所述，我是一个菜鸟。对此的任何帮助将不胜感激。
更新1：
重力解决方案给了我以下错误。
May 7 00:42:39 Ibrahim-Armars-MacBook-Pro postfix/pickup[4169]: DE2073F07C1: uid=501 from=<azhararmar>
May 7 00:42:39 Ibrahim-Armars-MacBook-Pro postfix/master[4185]: fatal: open lock file pid/master.pid: unable to set exclusive lock: Resource temporarily unavailable
May 7 00:42:39 Ibrahim-Armars-MacBook-Pro postfix/cleanup[4177]: DE2073F07C1: message-id=<20110506191239.DE2073F07C1@Ibrahim-Armars-MacBook-Pro.local>
May 7 00:42:39 Ibrahim-Armars-MacBook-Pro postfix/qmgr[4168]: DE2073F07C1: from=<azhararmar@Ibrahim-Armars-MacBook-Pro.local>, size=525, nrcpt=1 (queue active)
May 7 00:42:40 Ibrahim-Armars-MacBook-Pro postfix/smtp[4179]: DE2073F07C1: to=<azhar@iarmar.com>, relay=smtp.gmail.com[74.125.155.109]:587, delay=0.8, delays=0.01/0/0.79/0, dsn=4.7.5, status=deferred (TLS is required, but our …