Differences

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--- sendmail [2010/03/24 23:07] – created k2patel
+++ sendmail [2020/08/10 02:35] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ====== Sendmail ======
+==== How to create .cf file from .mc ====
+It is always best practice to build .cf file from .mc
+<code bash>
+m4 sendmail.mc > /etc/sendmail.cf
+</code>
+==== Rebuild aliases ====
+when you modify /etc/mail/aliases.\\
+Possibly you see following message. \\
+//**alias database /etc/mail/aliases.db out of date**// \\
+Simply run following and will fix it.
+<code bash>
+newaliases
+</code>
+OR\\
+run 'make' in /etc/mail to update all databases\\
+OR
+<code bash>
+sendmail -bi
+</code>
+==== Error Code 126 ====
+Following messages you see in log and mail.
+  * DSN: unknown mailer error 126
+  * stat=unknown mailer error 126
+  * runscript.sh: Permission denied
+  * 554 5.3.0 unknown mailer error 126
+It is because script you call to catch email OR execute when received has permission issue. \\
+Simply set permission on that script to "Sendmail Default User" could be 'daemon' or 'mailnull'. \\
+the names i have used those are i came across till now. so chances are there you see something diff. \\
+Whole path need to be executable by that user.
 ==== How to change outbound IP ====
@@ Line 11: / Line 47: @@
 NOTE : change 192.168.1.22 with your IP.
+==== Clear queue ====
+Check if you want to delete all mail.
+<code bash>
+mailq
+OR
+sendmail -bp
+</code>
+Now if you want to delete everything in queue just delete everything inside mqueue folder.\\
+In CentOS it is located at **/var/spool/mqueue/**
+<code bash>
+rm -rf /var/spool/mqueue/*
+</code>
+If there is too many files to remove you better use option like xargs with find.
+<code bash>
+find /var/spool/mqueue -name * -print0 |xargs -0 -r -n100 rm
+</code>