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Sendmail Masquerade Sender Email | Guide

Did you know that the masquerade sender feature in Sendmail allows us to modify the sender address of outgoing emails?

This comes in handy when we want to present a different sender address to the recipients instead of the actual address.

In other words, the masquerade feature applies address rewriting rules to modify the sender address.

Let’s take a look at how to configure Sendmail to get this done:

1. First, we have to locate the Sendmail configuration file and open it for editing, Usually, the file is located at /etc/mail/sendmail.mc.
2. Once we open the config file, find the FEATURE(genericstable’)`line.

   If the line is present but commented, we have to uncomment it. On the other hand, if the line is not present, we have to add it to enable the genericstable feature. This lets us define mappings between original email addresses and their corresponding masqueraded addresses.
3. Then, save the config file and regenerate it with this command:

   m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

   This will use the m4 macro processor to generate the actual Sendmail configuration file based on the changes made in step above.
4. Next, we have to create the genericstable file with this command:

   sudo nano /etc/mail/genericstable
5. Now, it is time to add the following to the genericstable file:

   original@example.com masqueraded@example.com

   Here we have to replace original@example.com with the original email address we want to masquerade, and masqueraded@example.com with the desired masqueraded email address.
   Additionally, we can add as many mappings as needed, each on a new line.
6. Finally, it is time ti save the file and generate the hashed version with this command:

   makemap hash /etc/mail/genericstable < /etc/mail/genericstable
7. Then, restart the Sendmail service to apply the changes.

After the above steps, Sendmail will masquerade outgoing email addresses via the genericstable feature.

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Conclusion

In brief, our Support Techs demonstrated how to masquerade sender emails in Sendamil