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Editorial Team
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Asked: 2026-05-27T11:31:44+00:00

How do I customize the body of the email using Log4net Smtp appender? I

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How do I customize the body of the email using Log4net Smtp appender? I wanted to add custom message to the body.

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  1. Editorial Team

    Given you are using an appender similar this

    <appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">
    <to value="to@domain.com" />
    <from value="from@domain.com" />
    <subject value="test logging message" />
    <smtpHost value="SMTPServer.domain.com" />
    <bufferSize value="512" />
    <lossy value="false" />
    <layout type="log4net.Layout.PatternLayout">
        <conversionPattern value="%message" />
    </layout>
</appender>

    You should be able to format the message using StringBuilder before logging:

    var sb = new StringBuilder();
sb.Append("Header");
sb.Append(Environment.NewLine);
sb.Append("Message");
...
var msg = sb.ToString();

ILog log = //resolve ILog
log.Debug(msg);

    More config samples here search for SmtpAppender

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