How to send colorful mail in nlog

Question

below config was my nlog setting, this setting send mail is OK .

<target name="mail" xsi:type="Mail"
            smtpServer="SMTP SERVER"
            smtpPort="25"
            smtpAuthentication="None"   
            enableSsl="false"   
            from="email address"  
            to="email address"
            html="true"
            encoding="UTF-8"
            addNewLines="true"
            replaceNewlineWithBrTagInHtml ="true"
            subject="SYSTEM MESSAGE：${machinename} 於 ${shortdate} ${time} create ${level} message "
            header="========================================================================="
            body="${newline} 
            time：${longdate} ${newline}${newline}
            Log level：${level:uppercase=true} ${newline}${newline}
            Logger：${logger} ${newline}${newline}
            Source：${callsite:className=true} ${newline}${newline}
            Exception：${exception:format=type} ${newline}${newline}
            Error message：${message} ${newline}${newline}"     
            footer="========================================================================="
    />

</targets>

 <rules>
    <logger name="*" minlevel="Fatal" writeTo="mail" />
 </rules>

but I want to send colorful mail. How to setting configure ?

I was looking for a way to HTMLise my body of NLog Mail Target. Then I came at this. Your formatting looks awesome to me for now so I am using this for a while. Thanks bruh. — taimur alam, Jul 06 '18 at 06:11

score 3 · Answer 1 · answered Jun 21 '19 at 19:25

For markup like colors in your e-mail, you need a html mail and CSS styling.

e.g. this html:

<body>
    <b style="color:red">Bold and red text</b>
</body>

You need to set the html option on the mail target to true and in your nlog.config you need to XML encode the html, so in result:

<target name="mail" xsi:type="Mail"
            html="true"
            ...

            body="&lt;body&gt;
&lt;b style=&quot;color:red&quot;&gt;Bold and red text&lt;/b&gt;
&lt;/body&gt;"
    />

Please note that not all CSS is supported in all email clients. See CSS Support Guide for Email Clients

score -1 · Answer 2 · answered Aug 19 '21 at 19:07

An easy approach is to log messages with the HTML already in the logged string, for example:

In the config file:

<targets>
   <target 
      name="mail" 
      xsi:type="Mail" 
      replaceNewlineWithBrTagInHtml="true"
      html="true"
      body="${message}"             
   />
</targets>
<rules>
    <logger name="*" minlevel="Info" writeTo="mail"></logger>
</rules>

In the code:

log.Info("<strong>My Bolded Message</string>");

Also, instead of inlining the HTML tags, one can use an HTML library like htmltags or even System.Xml.Linq to make it much more robust.

This approach is problematic if you have different log targets. You'll pollute all your other logs with HTML-Markup. — display-name, Jul 11 '22 at 07:31

How to send colorful mail in nlog

2 Answers2