KMail2 configuration

[David Bryant]

I have a question about one of the configuration screens for KMail.

I'm revising the documentation, which is seven years (±) out of date. In the 
"Identity" configuration dialog, "Advanced" tab, there are a few new fields. I 
can understand "Attach my vCard to message" and "Autocorrection language:". 
But the next field, "Default domain:", throws me for a loop.

I can see that the default value supplied by KMail came from /etc/conf.d/
hostname. But I don't understand how KMail uses this information. I think it 
must be related to "sendmail" running on a local area network, but since I 
don't have access to one of those, I can't easily test it to see how it works. 
And it would take far too long to understand the source code.

Can anybody explain what this field is for / how it works? I'm trying to be as 
thorough as possible with the rewrite. Thanks!
-- 
David Bryant
Canyon Lake, Texas
https://davidcbryant.net
mailto: davidbryant at gvtc.com
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