pgsandstrom / nopestradamus

Nopestradamus

Service for long term predictions.

Mail setup

Here I describe how to fix so the mail the program sends are not always marked as spam (but mostly they will be, either way).

SPF

SPF is some ancient security thing. It can be setup simply by adding stuff to the dns record. For nopestradamus I added this to my DNS record, to allow mail from these IPs: "v=spf1 ip4:138.197.184.62 ip4:93.188.3.35 include:nopestradamus.com -all"

DKIM

DKIM is the modern cool thing, but messy to set up. I eventually just used this tool: https://dkimcore.org/tools/keys.html But yeah, it feels a bit weird to generate private keys on some website... Then I just added to private key to the privkey.pem file that is referenced in the project. Then I added the following to a DNS record: v=DKIM1;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDOSKvTJpIe52Ow3ytinX5W1Mg7S10va8QY3wIhV5IY1x1woRbH+wM2Oa++3Cl60GPni7GJkIjnrusbgWTeEB3oy2q9bVbHqWfaDKsmrrdWr9QDAI+zJR1J2gwh9zowXYVC2yQFXW9UIjkB2oguFB2ZZ9c3jbbcz11//15tdqTRawIDAQAB

There is some weirdness about adding this DNS record. It belongs to the subdomain hej._domainkey.nopestradamus.com and when I send the mails I specify the keySelector 'hej'. I dont fully understand that. But whatever.

validate mail setup

Finally, when you receive a mail in for example gmail you can click 'show origin' to see if SPF and DKIM was accepted. This tool can be used to debug DKIM: https://www.dmarcanalyzer.com/dkim/dkim-check

Program to send the mails

You need to install postfix. Check out the docker files for that stuff.

Mail troubleshooting

postqueue -j is a nice command to check if the mails are not being sent. When running locally you will most likely get connection refused errors. I believe this is ISPs blocking outgoing mails.

Technical notes

The whole frontend should be rebuild without shitty mui/emotion crap.

The project is two processes: One nextjs project, and one node project which holds a cron job