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sending email on behalf of business partner

My company partner with a 3rd party company but we need to send some notification email to customer on behalf of this 3rd party company, let say 3rd party company is DEFI.COM and my company is XYZ.COM, I am thinking this way.  I request DEFI.COM company to create a 2nd level domain name and mapping to my smtp server like this...

projectA.DEFI.COM   ---> smtp1.xyz.com

the email address for notification sender email would be this  notification@projectA.defi.com

Because this email address is for outgoing email purpose, not for receiving.  Therefore; I think, there should not be any conflict, right?

The only thing is that this 3rd party company, just modify their DNS server.

any comment?
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KANEWONG
Asked:
KANEWONG
1 Solution
 
nociSoftware EngineerCommented:
There is no magic guard in SMTP/DNS or the internet that checks if your address is legitimate. (only your SMTP agent, more or less)
So you can send ANY mail with ANY from address if your xyz.com SMTP server allows for it.
You just need to configure your mailer for that, it should know about this different domain.
The DNS change only needs a MX record for the domain involved, pointing to your mailserver.

so
projectA.DEFI.COM   MX 100 smtp1.xyz.com

is all you need.
This is also the way that SPAM & ANTI-SPAM outfits work.
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