Need more help? Join the discussion. Was this information helpful? Yes No. Thank you! Any more feedback? The more you tell us the more we can help. Can you help us improve? Resolved my issue. Clear instructions. Easy to follow. No jargon. Pictures helped. Aliasing can be prevented by preceding the address with a backslash. Beginning with version 8. There are also many processing options that can be set. Normally these are only used by a system administrator. Options may be set either on the command line using the -o flag for short names , the -O flag for long names , or in the configuration file.
This is a partial list limited to those options that are likely to be useful on the command line and only shows the long names. The options are:.
In aliases, the first character of a name may be a vertical bar " " to cause interpretation of the rest of the name as a command that pipes the mail.
It may be necessary to quote the name to keep sendmail from suppressing the blanks from between arguments. For example, a common alias is:. Aliases may also have the syntax " :include:filename " to ask sendmail to read the named file for a list of recipients. For example, an alias such as:. Sendmail returns an exit status describing what it did. If invoked as purgestat , sendmail purges expired entries from the persistent host status database. If invoked as smtpd , sendmail acts as a daemon, as if the -bd option were specified.
Thus, these values should only be considered approximations. As an example, after running the above command, you could type:. Home Help Linux. Description Syntax Related commands Linux commands help. Was this page useful? Also, the "From:" and "Sender:" fields are examined for the name of the sender.
Run as a daemon. Purge expired entries from the persistent host status database. This flag implies all the operations of the -ba flag that are compatible with SMTP. Run in address test mode. This mode reads addresses and shows the steps in parsing; it is used for debugging configuration tables.
Verify names only; do not try to collect or deliver a message. Verify mode is normally used for validating users or mailing lists. Use alternate configuration file.
Send debugging output to the indicated log file instead of stdout. Set the debugging flag for category to level. The category is either an integer or a name specifying the topic, and level an integer specifying the level of debugging output desired. Higher levels generally mean more output. More than one flag can be specified by separating them with commas.
The option -d0. Create a file called mail. Paste the following content to it, but of course adjusting the email addresses, as those are just sendmail command examples:. Below is an example of how the simple sendmail test could look like on a live system:. One thing I'd like to add is that due to the fact that PHP and other scripts can usually access the sendmail binaries, it can also be used to send out spam and phishing mails and that's what can happen on shared servers where accounts were compromised through an outdated CMS or weak passwords.
If you want to find out which script or POSIX user is sending the spam with sendmail, you can issue the below command and pay close attention to the output:. While sendmail can pose a few risks on shared or insecure systems, it is a great lightweight MTA that can be used to send e-mails from shell scripts, PHP applications or even directly the command line.
Account Management. Tag Cloud. How to Test the Sendmail Command On Linux To quickly test if the sendmail command is working correctly to then use it for example in shell scripts, via command line or even from PHP scripts PHP supports sendmail to send emails from PHP scripts - you can set the sendmail path in your php.
Still, here is how you can do that: 1. Paste the following content to it, but of course adjusting the email addresses, as those are just sendmail command examples: To: my email.
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