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| Line 49: | Line 49: | ||
# Log in root@ip.address using password you provided | # Log in root@ip.address using password you provided | ||
<pre | <pre> | ||
apt-get update | apt-get update | ||
apt-get upgrade | apt-get upgrade | ||
apt-get install net-tools | apt-get install net-tools | ||
ifconfig | ifconfig | ||
</pre> | |||
That'll give you the ip4 and ip6 addresses, which go into the DNS text record: | That'll give you the ip4 and ip6 addresses, which go into the DNS text record: | ||
* v=spf1 ip4:66.23.226.216 ip6:fe80::216:3eff:fe24:10e1 -all | * v=spf1 ip4:66.23.226.216 ip6:fe80::216:3eff:fe24:10e1 -all | ||
Revision as of 17:54, 7 January 2022
Postfix Tutorials
- RedHat: https://www.redhat.com/sysadmin/install-configure-postfix
- Linux.com: https://www.linux.com/training-tutorials/install-and-configure-postfix-mail-server/
- Postfix: http://www.postfix.org/BASIC_CONFIGURATION_README.html
- DigitalOcean: https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-on-ubuntu-20-04
- Interesting - see: sudo DEBIAN_PRIORITY=low apt install postfix
SPF DNS Entry
Traxel Settings
- IPV4: 69.10.40.10
- IPV6: fe80::d227:88ff:fe34:7999/64
- Format: v=spf1 ip4:40.113.200.201 ip6:2001:db8:85a3:8d3:1319:8a2e:370:7348 include:thirdpartydomain.com ~all
- Start with the SPF version, v=spf1.
- Indicates that this is an SPF record.
- Will always be spf1 as other SPF versions have been discontinued.
- We'll only ever need 640K of RAM.
- Next, all IP addresses that are eligible to send email on behalf of your domain.
- Space delimited
- prefix ip[n]:
- ip4:69.10.40.10 ip6:fe80::d227:88ff:fe34:7999
- Next comes the include statement, which lists every third party organization that sends email on your behalf.
- Does this mean interserver? Is this the part where reverse lookups come in?
- include:thirdpartydomain.com
- The end of the SPF record is the strictness level.
- "-all" - strictest, fail email that doesn't come from this ip list
- "~all" - accept but flag email from other servers
- "+all" - anything goes
- I'll be using "-all".
Looks like the only remaining question is the "include" tag. How do I handle the include tag and/or flag my server from the reverse lookup standpoint?
- If no include:
- v=spf1 ip4:69.10.40.10 ip6:fe80::d227:88ff:fe34:7999 -all
- This works. Problem solved. Grumble.
- If yes include:
- v=spf1 ip4:69.10.40.10 ip6:fe80::d227:88ff:fe34:7999 include:systemicbias.com -all
DeadmanDAO
- go to interserver
- create a single slice instance ($6/mo at this time)
- Debian
- KVM
- Log in root@ip.address using password you provided
apt-get update apt-get upgrade apt-get install net-tools ifconfig
That'll give you the ip4 and ip6 addresses, which go into the DNS text record:
- v=spf1 ip4:66.23.226.216 ip6:fe80::216:3eff:fe24:10e1 -all