Open port 25 on DigitalOcean server

[sangroot]

I went through the documentation of (https://docs.cloudron.io/email/#required-ports).
I check when I try to send the mail, the mail is not received, I believe it is blocked port 25.
I don't want to forward the mail anywhere, I can open that port 25 directly on my vps or somehow can send and receive mail.
Thanks

[nebulon]

Incoming port 25 should already be open. However most VPS provider will block outbound port 25 to reduce spam.
Do you have an extra firewall in front of your server or what exactly is the issue you are facing?

[sangroot]

I asked DO to open port 25 complete, but PTR port is having problem.

[sangroot]

I have not been able to send mail even though I have opened all the ports.

[BrutalBirdie]

@sangroot and what about this other red information This server's IP 139.59.224.167 is on a blocklist.?
By SpamHaus Zen.

[sangroot]

@brutalbirdie said in Open port 25 on DigitalOcean server:

and what about this other red information This server's IP 139.59.224.167 is on a blocklist.?
By SpamHaus Zen.

This is the server I just created from DO, is there any way to appeal, or do I have to create another server and start over with Cloudron

[BrutalBirdie]

@sangroot sorry but can you at least google yourself or just click the URL with the error / warning?

But yes of course there is a way that's why this check is there in the first place.

https://check.spamhaus.org/listed/?searchterm=139.59.224.167

[nebulon]

@sangroot this unfortunately means that your server got an IP with a bad reputation ending up in the blocklist. To explain, those IPs are constantly reused and it could just be that either this IP itself was used by a spammer in the past or that some other IPs in that IP block might have been spammer IPs.

This is not unusual though and it takes a bit to get IP reputation up and manually removing it from blacklists by appealing is the first step in this case.

If you need to deliver emails reliably from the start, you may consider using a mail relay configured through Cloudron for some time until you are off of all those blocklists.