Archive for the tag 'source IP address'

Change SMTP source IP address in sendmail

1. Edit sendmail.cf search for ClientPortOptions

2. Change

#O ClientPortOptions=Family=inet, Address=x.x.x.x

to

O ClientPortOptions=Family=inet, Address=

3. Restart sendmail

4. Verify by sending a mail and checking the full header

CLIENT_OPTIONS(`field1=value1,field2=value2,…’) in sendmail.mc file is equivalent to ClientPortOptions in the sendmail.cf file.