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On a Debian 4.7.2-5, I got some problems sending mail correctly with sendmail. It appears that ELHO sender is different from domain name. When I ask machine for its hostname FQDN :

hostname -f

I got as answer mydomain.com.mydomain.com

UPDATE : content of /etc/hosts

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
127.0.0.1       mydomain.com

1.2.3.4         mydomain.com

# OVH stuff , I don't use IPV6
2001:41D0:2:97b9::      nsXXXX.ip-1-2-3.eu      nsXXX

# The following lines are desirable for IPv6 capable hosts
#(added automatically by netbase upgrade)

::1     ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

UPDATE : content of /etc/nsswitch.conf (hosts part) AND /etc/mail/service.switch (identical)

hosts:          files dns

Where does this can come from?

Many thanks for your answers, I'm bit stuck on this one.

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4
  • Could you post lines with mydomain.com in your /etc/hosts? Does your DNS domain mydomain.com contain wildcard records?
    – AnFi onet.eu
    Commented Sep 21, 2015 at 9:59
  • I just did in main question. Thanks for your feedback.
    – nbonniot
    Commented Sep 21, 2015 at 10:16
  • Could you include hosts lines from /etc/nsswitch.conf and /etc/mail/*.switch files?
    – AnFi onet.eu
    Commented Sep 21, 2015 at 15:38
  • Sorry for the delay. It's done and for the record, only one *.switch file, service.switch.
    – nbonniot
    Commented Sep 22, 2015 at 8:59

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