Welcome to YourTech, LLC. If you are unfamiliar with this site, you may want to find out about my services, read my story, or you could simply be looking for a way to contact me. On this site, you will find a collection of technical musings, howto guides, and technical reference information.
If you have a server with multiple ip addresses, sendmail will default to sending email out using the first ip address.
If you want to explicitly use a different IP address, you can configure it in /etc/mail/sendmail.mc
Add the line CLIENT_OPTIONS:
CLIENT_OPTIONS(`Family=inet,Adress=1.2.3.4')dnl
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