Exim4 預設會 reject 掉 hostname 中含有 underscore 的連線（例如 MY_MAILSRV），這樣子的 hostname 其實是不符合規範的，所以 mail server 把來自這種 hostname 的連線擋掉聽起來也頗合理。但是 MS Exchange Server 卻允許自己的 hostname 中有 underscore，其結果就是送出去的信人家不一定收。
看到這裡你一定覺得奇怪，這整件事是 Exchange 的錯（或說是設定 Exchange 的人的錯），關 Exim4 什麼事？我也這麼想，但是當你非得收來自這種狗爛 server 的信的時候，你就會需要下面這行設定：
helo_allow_chars = _把它加進你的 exim4.conf 裡吧！還有多看 FAQ。
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