Cloudron email Server - multiple domains
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@humptydumpty Thanks for saving me some testing time.
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FYI: There is another local sending IP leak that happens with most mobile/desktop clients but not web clients, like snappy.So keep that in mind if you don't care to have your current local IP be sent in plain text via the email headers.
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@humptydumpty it may not help as the email client doesn't care what your VPN interface is, only the local native interface. Always validate, even then, safer to use the web interface of the sending SMTP server.
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@robi said in Cloudron email Server - multiple domains:
local native interface.
Just to make sure i understood you correctly, you’re referring to the ipv4 address that i get from my ISP, right?
If so, how can an app sneak behind my VPN client?
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@humptydumpty Yes.
It's not that it sneaks behind or doesn't use your VPN, it's that is has access to your actual IP when the headers are generated before it sends it over the VPN.
Last time I tried there was no way to configure the client to avoid that. Hard coded.
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Yes, every server that the mail passes through gets documented with a received header in the message.
https://www.thesslstore.com/blog/how-to-read-an-email-header/
The client can not influence this, but the mail server could remove this information. https://serverfault.com/questions/413533/remove-hide-client-sender-ip-from-postfix
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I really am amazed at you all. You are quite awesome in your ability to keep these complexities clear in your mind. I find it difficult to even phrase the issues let alone understand them.
Let me try this and hopefully somebody will be able to help me:
There is one server over there (not a Cloudron) doing its own thing, but without individual mailboxes for people, because of the costs. Lets call it cheapo.com
Purely (initially anyway) to help solve cheapo's lack of emails problem, we have this idea: setup a new server on a completely different VPS, a cloudron, on a sub-domain of cheapo.com, for example mail.cheapo.com
Would we be able to do that? Once it was up and running, then setup snappy and give everybody in cheapo.com email addresses? e.g.
alice@cheapo.com
bob@cheapo.com
charlie@cheapo.comor would the email addresses need to have some "ugly" appearance, like:
alice@mail.cheapo.com
or something like that. -
No ugly. Set up the Cloudron. Use mail.cheapo.com as the mail server. Add the domain cheapo.com in CR dash under domains. Create mailboxes like Alice@cheapo.com and have folks access it through snappy.
If manual dns, don’t forget to set up records for spf, dkim, and dmarc.
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@humptydumpty said in Cloudron email Server - multiple domains:
No ugly. Set up the Cloudron. Use mail.cheapo.com as the mail server. Add the domain cheapo.com in CR dash under domains. Create mailboxes like Alice@cheapo.com and have folks access it through snappy.
If manual dns, don’t forget to set up records for spf, dkim, and dmarc.
Hey, thank you! Would it matter what domain was used for the registration of the cloudron in this case? For example, could I setup the cloudron with the name e.g. anythingwilldo.com (rather than as I had originally suggested using a subdomain of cheapo.com), register that with cloudron.io and then do the important part of configuring the mail server for anythingwilldo.com to be (in this case) mail.cheapo.com and in the cloudron dashboard add cheapo.com as domain?
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@LoudLemur You could do that. No problem. You can specify the mail server location to be any SUB and pick any of the domains you have set up in Cloudron. To make things even wackier, you could use multiple subdomains like sub.sub.domain.com as the mail server.
