Security/Domain: Difference between revisions

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  '''SPF TXT Record Format'''
  '''SPF TXT Record Format'''
  v=spf1 ['''mechanism'''] ['''qualifier'''] ['''modifiers'''] ...
  v=spf1 ['''mechanism'''] ['''qualifier'''] ['''modifiers'''] ...
{|class="wikitable"
|-
!scope="col" style='width:100px'| Qualifier
!scope="col" style='width:100px'| Meaning
!scope="col" style='width:200px'| Action
!scope="col" style='width:280px'| Usage
|-
| <code>+all</code>    || Pass      || Accept mail from any IP || ☠️ Not recommended
|-
| <code>-all</code>    || Hard fail || Reject non-matching IPs || ✅ Strict enforcement
|-
| <code>~all</code>    || Soft fail || Accept but mark as spam || 👍 Recommended during rollout
|-
| <code>?all</code>    || Neutral  || No policy guidance      || 🤷 Rare, for undefined policies
|}


# Run a Composite Check:  
# Run a Composite Check:  

Revision as of 08:00, 30 May 2025

Tools » Install » SPF

cat <<'EXE'| sudo bash
echo && git clone https://github.com/jsarenik/spf-tools.git /opt/cli/spf-tools
echo && cd /opt/cli/spf-tools/
./despf.sh -h
EXE

cat <<'CFG'| tee ${HOME}/.spf-toolsrc >/dev/null
DOMAIN=shahed.biz
ORIG_SPF=spf.shahed.biz
DESPF_SKIP_DOMAINS=_spf.google.com:_spf.sendgrid.net
DNS_TIMEOUT=5
DNS_SERVER=1.1.1.1
CFG

Tools » Install » DKIM

cat <<'EXE'| sudo bash
apt-get update;echo
apt list -a --upgradable;echo
apt-get install -y opendkim-tools;echo;apt-get clean
EXE

DNS » Record » TXT » SPF

SPF TXT Record Format
v=spf1 [mechanism] [qualifier] [modifiers] ...
Qualifier Meaning Action Usage
+all Pass Accept mail from any IP ☠️ Not recommended
-all Hard fail Reject non-matching IPs ✅ Strict enforcement
~all Soft fail Accept but mark as spam 👍 Recommended during rollout
?all Neutral No policy guidance 🤷 Rare, for undefined policies
  1. Run a Composite Check:
  2. Use SPF Flattening
  3. Manually
    • Check for
      Proper -all ending
      Lookup count ≤ 10
      No multiple TXT records
      Only needed services included

DNS » Record » TXT » DKIM

Playground

dig MX  chorke.org
dig TXT chorke.org
openssl s_client -connect mail.chorke.org:25
apt info   opendkim-tools
apt search opendkim-tools
sudo apt-get install -y opendkim-tools
sudo git clone https://github.com/jsarenik/spf-tools.git \
   /opt/cli/spf-tools
cd /opt/cli/spf-tools/

References