I have exim4 configured on my server as an email forwarder (for example sending an email to email@example.com will result in the email being forwarded to my personal gmail email account).
This setup works perfectly fine, although things start to get annoying when I went to send an email directly from the server using mail. For some reason, mailx always uses @debian as its domain name. I can fix this by manually specifying the sender when using mailx (I usually just do something like echo "yo" | mailx -s "hi there" firstname.lastname@example.org), but that seems unnecessary as I'm able to send emails properly from a friend's server without having to specify the ender email address.
One thing I did notice is that I had forgotten to configure the /etc/hosts file when I initially created the server (had torn down a vps a rebuilt it). So I did that and reconfigured exim just be safe, but that did not have any effect.
Here is what I currently have in my update-exim4 file:
dc_eximconfig_configtype='internet' dc_other_hostnames='NoneOfYourBusiness.org;NotForYourEyes.me' dc_local_interfaces='' dc_readhost='' dc_relay_domains='' dc_minimaldns='false' dc_relay_nets='' dc_smarthost='' CFILEMODE='644' dc_use_split_config='false' dc_hide_mailname='false' dc_mailname_in_oh='true' dc_localdelivery='mail_spool'
Would any have suggestions for correcting this behavior? Thank you