2degrees SMTP - can it act as an inbound relay?

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Benoire

2799 posts

Uber Geek

#251129 10-Jun-2019 11:55

@nickmack

I might have got this wrong and barking up the wrong tree but thought I'd test it out! I;ve got a single static IPv4 and /56 IPv6 through 2degrees. I have a family mail server on the other end of the IPv4 address which 2degrees also kindly set the PTR to the mail domain name... I'd like to free up the IPv4 for other port 80/443 stuff and would like to utilise the IPv6 connection.

I use MXGuardDog for my email filter but they only operate on IPv4 and have no intention yet to move to IPv6 so I was wondering if I could relay my clean emails from MXGuardDog to the 2degrees SMTP server which could then send them over IPv6 to my server? Can it do this or have I got it wrong? I've thought about spinning up a cloud instance on Vultr for around $5 a month to run a simple MX relay but curious if I can do it locally isntead...

If I have got how the SMTP server works and you can't can anyone suggest an alternative system that I can do this? I know I can use reverse proxies to run on a single IP address but some of the windows apps use uPNP and steal the ports away from the static setup and there appears to be no way to stop my USG from giving those over while keeping uPNP active.

Cheers in advance

Chris

dfnt

1514 posts

Uber Geek

Lifetime subscriber

#2255169 10-Jun-2019 12:18

No you can't do that with their smtp

You could simplify your life if you just used one of the many email hosting solutions e.g. gsuite, o365, etc instead of hosting mail yourself

Benoire

2799 posts

Uber Geek

#2255238 10-Jun-2019 13:10

I could but I'm hosting the family, so 4 main email addresses plus house related ones... Hosting those online is expensive compared to my system and the running costs per month; I also utilise the VM hosts for other stuff as well so its all good.

dfnt

1514 posts

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Lifetime subscriber

#2255243 10-Jun-2019 13:20

I think Zoho Mail is relatively cheap and I've seen recommended on here https://www.zoho.com/mail/zohomail-pricing.html

Zeon

3918 posts

Uber Geek

Trusted

#2255247 10-Jun-2019 13:23

SMTP only uses port 25, you are free to use port 80 and 443 - if they go to different servers just setup different port forwards?

Speedtest 2019-10-14

SirHumphreyAppleby

2852 posts

Uber Geek

#2255296 10-Jun-2019 14:31

As Zeon said, there is nothing stopping you using HTTP(S) on the same IP as SMTP. HTTP(S) does not rely on the PTR in any way. I've run all three services alongside each other on a residential connection just fine. These days however, I've moved my HTTP(S) to virtual machines. Ignore the naysayers, there is nothing wrong with running your own mail server, but you do have to jump through a few relatively low-hanging hoops to do so... and basically have no choice of ISP (Voyager and 2degrees are the most 'prosumer' friendly). If you really want to have MX services delivering to non-standard ports on IPv6, you can always set up a virtual machine somewhere to forward the mail for you. I recommend OpenSMTPD... it's almost trivial to set up an MX using that.

Benoire

2799 posts

Uber Geek

#2255558 10-Jun-2019 20:49

Hi everyone, in a complete moment of stupidity and as pointed out above, what I wanted to do was free ports 80 and 443 for other moronic windows programs that use uPNP and like to steal 443 especially... What I forgot and thanks @Zeon is that I only need port 25 open for SMTP which I can do fine with my single IPv4 and the can route the webmail access and others such as pop etc. to the IPv6 range... D'oh! Consider this case closed :-)