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How are you sending the mail? &nbsp;You should be able to set the return-path with the -f flag to sendmail, and configure any From address you want.
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This only affects emails sent from the shell? &nbsp;Look at configuring the email client settings to use a
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xterm: &gt;&nbsp;You should be able to set the return-path with the -f flag to sendmail, and configure any From address you want. 
 
My email client is mailx 12.4. The option to do what you are describing is -r which sets the From address. That used to work just fine to set whatever address I wanted as the Reply-To:. Since setting /etc/virtusertable and /etc/local-host-names it will set the username part of the address, but always overrides what I specify as the domain. mailx also let's me specifically set From:, Reply-To: and Sender: The domains on all of these settings get overridden. 
 
Arnold: &nbsp;&gt; Look at configuring the email client settings 
 
Did that, and have had those set and working for years. With mailx you use the -A &lt;account&gt; parameter which looks up e.g. 
 
account mercurey { 
&nbsp; &nbsp; set from=&quot;myuser@thathost.com (Mark Foley)&quot; 
&nbsp; &nbsp; set hostname=thathost.com 
&nbsp; &nbsp; set ORGANIZATION=&quot;Mercurey Technologies SA, Limited&quot; 
} 
 
in the $HOME/,mailrc file. Again, this has always worked until I set the virtusertable and local-host-names. 
 
So, I don't think this is something I can fix from the mail client. I could remove the settings in virtusertable and/or local-host-names, but then this host won't be able to receive mail for thathost.com. 
 
I could remove the MASQUERADE directive in sendmail.mc, but then I'll have the machine name attached to the domain name in the messages. 
 
I'm sure I have some sendmail configuration wrong. Computers host email for multiple domains all the time. I've just never set this up before. 
 
I'm in a quandary!
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I've tried two things, both of which appear to have worked: 
 
1) I removed all MASQUERADE directives in sendmail.mc and put in $HOME/.mailrc e.g. 
 
account thatDomain { 
&nbsp; &nbsp; set from=&quot;user@thathost.com (My Name)&quot; 
&nbsp; &nbsp; set hostname=thathost.com 
&nbsp; &nbsp; set ORGANIZATION=&quot;Mercurey Technologies SA, Limited&quot; 
} 
 
for each account I want to use. The &quot;set from&quot; seems to do the trick. I don't see that the &quot;set hostname&quot; does much. 
 
2) I kept MASQUERADE_AS in sendmail.mc, removed FEATURE(`masquerade_envelope') 
(not sure why I had that one set in the first place) and FEATURE(`masquerade_entire_domain'). I then added MASQUERADE_EXCEPTION(`thathost.com') 
 
Both of these seem to work. Probably method 1 is more desirable because I'd have to set a MASQUERADE_EXCEPTION for each domain hosted. 
 
I suppose if I multi-home a dozen different domains I'll have to have the appropriate &quot;set from&quot; in each user's .mailrc file. 
 
Is this the normal way multi-homed hosts set up their email users? Seems highly dependent on the mail client used.
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I have a host with multiple domain names: thishost.com, thathost.com. My sendmail.mc file has: 
 
MASQUERADE_AS(`thishost.com') 
FEATURE(`masquerade_envelope') 
FEATURE(`masquerade_entire_domain') 
 
I originally had this setting before adding thathost.com, mainly to prevent the hostname from showing up in the From: &nbsp;address. e.g. myuser@thishost.com instead of myuser@server.thishost.com. &nbsp;However, when I added thathost.com to /etc/mail/local-host-names and the line 
 
thisuser@thathost.com &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;thisuser 
 
to the /etc/virtusertable, I cannot send mail addressed from users on thathost.com. The domain always gets changed to thishost.com. E.g. a message sent by thatuser@thathost.com gets sent as From: thatuser@thishost.com. 
 
I suspect the way to fix this is to remove the MASQUERADE_AS directives in sendmail.mc, but I'd like some confirmation from a expert before I start experimenting.
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I have a host with multiple domain names: thishost.com, thathost.com. My sendmail.mc file has: 

MASQUERADE_AS(`thishost.com')
FEATURE(`masquerade_envelope')
FEATURE(`masquerade_entire_domain')

I originally had this setting before adding thathost.com, mainly to prevent the hostname from showing up in the From:  address. e.g. myuser@thishost.com instead of myuser@server.thishost.com.  However, when I added thathost.com to /etc/mail/local-host-names and the line

thisuser@thathost.com          thisuser

to the /etc/virtusertable, I cannot send mail addressed from users on thathost.com. The domain always gets changed to thishost.com. E.g. a message sent by thatuser@thathost.com gets sent as From: thatuser@thishost.com.

I suspect the way to fix this is to remove the MASQUERADE_AS directives in sendmail.mc, but I'd like some confirmation from a expert before I start experimenting.

How to keep virtual domain name on outgoing sendmail

Linux is a UNIX-like open source operating system with hundreds of distinct distributions, including: Fedora, openSUSE, Ubuntu, Debian, Slackware, Gentoo, CentOS, and Arch Linux. Linux is generally associated with web and database servers, but has become popular in many niche industries and applications.

Linux

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.