EnglishConfiguration -> Mail setup -> Edit domain -> Relay options
I’m trying to use mailcow running on an OVH server as a relay host for my home-nas that is on my home ISP network and unable to mail directly. Is this relay option useful in this context? I’ve been through the 
mailcow dockerized documenation but don’t find any info about it. mailcow.github.io
Yes, you could use mailcow to relay your domain via this settings. However, can’t you use your ISP mailserver to relay your mail? (Authentication needed to use your isp mailserver as relay).
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I could, but then mail would go out as having been sent by my ISP email account. My objective was to be able to send mail from my NAS in a semi transparent way, as if the server wasn’t on a consumer IP address.
