Operating Synology Mail Plus Server with Pangolin

[Stefan2706]

Hello,

I am running Pangolin on a Hetzner server in Germany. Thank you very much for creating such a great solution. I would like to make my Synology Mailplus server accessible via Pangolin. Is this possible? Do you have any instructions for this?

Many thanks and best regards from Germany
Stefan

[oschwartz10612]

Hi! Glad you are liking pangolin!

I cant say we are familiar with Synology Mailplus server but if it is web based you should be able to do it fairly easily! If you also need SMTP and IMAP ports exposed you could use https://docs.fossorial.io/Pangolin/tcp-udp. Just make sure Hetzner does not block SMTP. I am not sure how this could impact email deliver ability though.

[Kazumasan]

Hi,

I'm also interested in proxying a Mail server.
Mail delivery is dependent on 4 things.

Easy:
DMARC -> Tells the Receiving party how to act regarding SPF and DKIM checks
DKIM -> Signs your mail to Prove its send by your servers
SPF -> a list of allowed sending Servers/Domains

Hard because ISPs suck:
PTR-Records -> a reverse DNS entry to verify that your IP is Part of the Domain used by the Mail server

With some VPS providers, it's possible to set a PTR record for leased PIPs (Public IPs). With your ISP, probably not so much, unless you are a Business customer.

The Solution to that Problem is to Use the Reverse Proxy as a normal TCP/UDP Proxy. Which is a rather Simple Task if we do not want to use any middleware.

@oschwartz10612 Do you think it's Possible to use the Newt / Gerbil Structure already in place with Pangolin, to use the Pangolin-Host as en "exit" node ? Maybe it's possible to set the Newt as the default gateway for a MTA?

So that a VPS with the corresponding PTR would be the Sending and Receiving end ?

[oschwartz10612]

It has been requested a bunch and I think this could work at some point. Right now with newt being mostly in user space it does not expose a VPN interface on the host to do this but it could proxy or it could open a native WG interface in the future to do something like this. After that sending it out Gerbil would just be a matte of routing!

[Stefan2706]

Hello,
Unfortunately, I haven't been able to get my mail plus server to work via Pangolin. I rented a VPS from Hetzner. Pangolin is running on it. I enabled the relevant ports and also had Hetzner enable the mail ports. Nevertheless, it still didn't work.