@girish So I tried direct MX to my home and got errors:
[Default] 451-'4.7.1 Greylisting in action, please come back later' (delivery attempts: 5)>'
So back to my original problem now - I'm thinking of either putting procmail on Synology and fetch emails or either use iptables/VPN route to send email home.
@infogulch Thank you that was insightful.
Outbound is answered via that post.
For inbound, here's what I'm thinking now :
Another question is that can I even use Cloudron as a "relay server" from downstream server ? I wasn't able to find any option to whitelist IP or any other way apart from authenticating users at cloudron for outbound emails.
@timconsidine said in Forward emails to remote SMTP server:
EDIT : could a sieve filter work to forward all incoming email to another server ? Then just delete/purge periodically on initial receiving server after a time period.
I've looked into this but it doesn't seems to be an option. Sieve filter can only redirect to another "email" rather than a mail server. In this case - both emails would be same as we are just forwarding it to a remote mailbox.
@girish said in Forward emails to remote SMTP server:
@binary1zero there is no built-in solution for forwarding to another email server.
This is indeed an interesting request though. I guess this allows a setup where the mail is actually stored at home? Also, if the server is at home, how will you access email when outside? Does this mean you will have the home server partially exposed to the world for mail access? In addition, on many ISPs, inbound port 25 is blocked (yes, even inbound, like in comcast).
Exactly what you said. Plan is to run Cloudron/or other mail server on my Synology at home which has ample amount of storage but since ISP cannot give PTR and other settings - I'm using DigitalOcean droplet with Cloudron for my incoming mail (and it works beautifully).
However, it's expensive to store big mailboxes in cloud. So idea is to receive email via cloudron but forward to downstream mail server at home. Home mail server will be exposed enough to access via IMAP etc.. and it will relay all outbound emails via Droplet/Cloud.
@girish yes it would have both (another Cloudron or Synology mail server). Plan is users will reach out to Synology directly.
Folks,
I'm running a Cloudron instance in DigitalOcean which is working great. My use case requires that Cloudron receive all inbound traffic and then forward all (or selected) mailboxes to a remote SMTP server (not an email) which has more storage etc...
I wasn't able to find any feature like this. Can someone confirm if it is possible at all ?
E.g.
Inbound email (to: user@domain.com) -> Cloudron @ DO -> Internal SMTP Server with bigger storage.
Outbound email (from: user@domain.com) -> Cloudron @ DO -> Internet