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linux - Why does sendmail changes the FROM domain and how to configure the proper one?

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I installed Jenkins and configured it
to send emails as being sent from "jenkins@jenkins.example.com" but the address is
always changed when email is being sent and I receive the mail as being sent from
"jenkins@default.vps.example.com".




I've
installed Sendmail and Jenkins is configured to use 127.0.0.1 as mail
server.



Any idea why Sendmail replaces the FROM
domain when email is being sent?



The hostname of
the server is properly set (when I run hostname I do get
"jenkins.example.com").



Same way if I send an
email from command line echo "This is the body" | mail -s "Subject"
u@d.com



From where does it take
this default.vps.example.com domain? Where is this default
domain configurable?




LE: in my
sendmail.mc I have define(confDOMAIN_NAME',
jenkins.domain.com')dnl and I generated the sendmail.cf file
m4 sendmail.mc > sendmail.cf and restarted sendmail. Still
doesn't
work.



LE2:



ADDRESS
            TEST MODE (ruleset 3 NOT automatically invoked)
Enter 
            

> canonify input: jenkins @ jenkins . example .
            com
Canonify2 input: jenkins < @ jenkins . example . com
            >
dns_getcanonname(jenkins.example.com,
            trymx=1)

dns_getcanonname: trying jenkins.example.com.
            (AAAA)
 YES
dns_getcanonname: trying default.vps.example.com.
            (AAAA)
 NO: errno=0, h_errno=4
dns_getcanonname: trying
            default.vps.example.com. (A)
 YES
dns_getcanonname:
            default.vps.example.com
Canonify2 returns: jenkins < @ default . vps .
            example . com . >
canonify returns: jenkins < @ default . vps . example
            . com . >
>



Answer




Quite likely your sendmail replaces names with DNS
CNAME record (DNS alias) with "true
names".



As root execute echo '3
jenkins@jenkins.example.com' | sendmail -d8.20 -bt
It should
show you DNS queries during email address preprocessing (by rule set
3).



href="http://cr.yp.to/im/cname.html" rel="nofollow
noreferrer">http://cr.yp.to/im/cname.html




D. J.
Bernstein
CNAME records in mail
RFC
821 prohibited all use of ``nicknames or aliases'' in domain names in SMTP requests. RFC
1123 specifically prohibited DNS aliases (domains with CNAME records) in MAIL and RCPT
requests.
sendmail accepts a domain with a CNAME record. It replaces the
domain with the CNAME value before using it in RCPT, unless it is acting as a dumb
client. Similar comments apply to qmail and other mailers.





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