this post was submitted on 22 Apr 2024
35 points (92.7% liked)

Selfhosted

40190 readers
512 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

  1. Be civil: we're here to support and learn from one another. Insults won't be tolerated. Flame wars are frowned upon.

  2. No spam posting.

  3. Posts have to be centered around self-hosting. There are other communities for discussing hardware or home computing. If it's not obvious why your post topic revolves around selfhosting, please include details to make it clear.

  4. Don't duplicate the full text of your blog or github here. Just post the link for folks to click.

  5. Submission headline should match the article title (don’t cherry-pick information from the title to fit your agenda).

  6. No trolling.

Resources:

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 1 year ago
MODERATORS
 

I have a raspberry pi running postfix. I Realised unless I open port 25 I absolutely cannot receive emails (I have 587 open and can send but not receive them). However I heard there are scaries online which someone could potentially send emails from your server without consent. I believe as well my ISP doesn't block port 25. Is there anything I should do right now before opening port 25, or should everything be safe enough?

you are viewing a single comment's thread
view the rest of the comments
[–] TCB13 7 points 6 months ago* (last edited 6 months ago) (1 children)

If you follow the ISPMail guide at https://workaround.org/ you'll be safe.

I heard there are scaries online which someone could potentially send emails from your server without consent

That's called an open relay and websites like https://mxtoolbox.com/diagnostic.aspx can test for it.

Either way your biggest issue won't be that, if you're running on a residential internet connection the IP is already flagged as such and will have a very low reputation with other e-mail providers causing Microsoft, Google and any other large provider will simply refuse your email. You'll also need reverse DNS for your IP pointing at the domain you're using that your ISP is most likely not going to provide.

[–] [email protected] 1 points 6 months ago (1 children)

What do you mean reserve DNS?

[–] [email protected] 6 points 6 months ago (1 children)

Pretty sure they meant reverse dns :)

[–] TCB13 5 points 6 months ago

Yes, reverse DNS. Typo there.