Package: trustymail
Trustworthy Mailtrustymailis a tool that evaluates SPF/DMARC records set in a
domain's DNS. It also checks the mail servers listed in a domain's MX
records for STARTTLS support. It saves its results to CSV or JSON.Getting startedtrustymailrequiresPython 3.6+. Python 2 is not supported.Local installationtrustymailcan be installed directly via pip:pip install trustymailIt can then be run directly:trustymail [options] example.comorpython3 -m trustymail [options] example.comUsing Docker (optional)./run [opts]optsare the same arguments that would get passed totrustymail.Usage and examplestrustymail [options] INPUTtrustymail dhs.govtrustymail --output=homeland.csv --debug cisa.gov dhs.gov us-cert.gov usss.govtrustymail agencies.csvNote: if INPUT ends with.csv, domains will be read from CSV. CSV
output will always be written to disk, defaulting toresults.csv.Options-h --help                   Show this message.-o --output=OUTFILE         Name of output file.  (Default results)-t --timeout=TIMEOUT        The DNS lookup timeout in seconds.  (Default is 5.)--smtp-timeout=TIMEOUT      The SMTP connection timeout in seconds.  (Default is 5.)--smtp-localhost=HOSTNAME   The hostname to use when connecting to SMTPservers.  (Default is the FQDN of the host fromwhich trustymail is being run.)--smtp-ports=PORTS          A comma-delimited list of ports at which to lookfor SMTP servers.  (Default is '25,465,587'.)--no-smtp-cache             Do not cache SMTP results during the run.  Thismay results in slower scans due to testing thesame mail servers multiple times.--mx                        Only check MX records.--starttls                  Only check MX records and STARTTLS support.(Implies --mx.)--spf                       Only check SPF records.--dmarc                     Only check DMARC records.--json                      Output is in JSON format.  (Default is CSV.)--debug                     Output should include more verbose logging.--dns=HOSTNAMES             A comma-delimited list of DNS servers to queryagainst.  For example, if you want to useGoogle's DNS then you would use thevalue --dns-hostnames='8.8.8.8,8.8.4.4'.  Bydefault the DNS configuration of the host OS(/etc/resolv.conf) is used.  Note thatthe host's DNS configuration is not used at allif this option is used.--psl-filename=FILENAME     The name of the file where the public suffix list(PSL) cache will be saved.  If set to the name ofan existing file then that file will be used asthe PSL.  If not present then the PSL cache willbe saved to a file in the current directory calledpublic_suffix_list.dat.--psl-read-only             If present, then the public suffix list (PSL)cache will be read but never overwritten.  Thisis useful when running in AWS Lambda, forinstance, where the local filesystem is read-only.What's checked?For a given domain, MX records, SPF records (TXT), DMARC (TXT, at_dmarc.<domain>), and support for STARTTLS are checked. Resource records can
also be checked for DNSSEC if the resolver used is DNSSEC-aware.The following values are returned inresults.csv:Domain and redirect infoDomain- The domain you're scanning!Base Domain- The base domain ofDomain. For example, for a
Domain ofsub.example.gov, the Base Domain will beexample.gov. Usually this is the second-level domain, buttrustymailwill download and factor in thePublic Suffix
Listwhen calculating the base domain.Live- The domain is actually published in the DNS.Mail sendingMX Record- If an MX record was found that contains at least a
single mail server.MX Record DNSSEC- A boolean value indicating whether or not the
DNS record is protected by DNSSEC.Mail Servers- The list of hosts found in the MX record.Mail Server Ports Tested- A list of the ports tested for SMTP and
STARTTLS support.Domain Supports SMTP- True if and only ifanymail servers
specified in a MX record associated with the domain supports SMTP.Domain Supports SMTP Results- A list of the mail server and port
combinations that support SMTP.Domain Supports STARTTLS- True if and only ifallmail
servers that support SMTP also support STARTTLS.Domain Supports STARTTLS Results- A list of the mail server and
port combinations that support STARTTLS.Sender Policy Framework (SPF)SPF Record- Whether or not a SPF record was found.SPF Record DNSSEC- A boolean value indicating whether or not the
DNS record is protected by DNSSEC.Valid SPF- Whether the SPF record found is syntactically correct,
per RFC 4408.SPF Results- The textual representation of any SPF record found
for the domain.Domain-based Message Authentication, Reporting, and Conformance (DMARC)DMARC Record- True/False whether or not a DMARC record was found.DMARC Record DNSSEC- A boolean value indicating whether or not
the DNS record is protected by DNSSEC.Valid DMARC- Whether the DMARC record found is syntactically
correct.DMARC Results- The DMARC record that was discovered when querying
DNS.DMARC Record on Base Domain,DMARC Record on Base Domain DNSSEC,Valid DMARC Record on Base Domain,DMARC Results on Base Domain- Same definition as above, but returns the result for the
Base Domain. This is important in DMARC because if there isn't a
DMARC record at the domain, the base domain (or "Organizational
Domain", perRFC
7489), is
checked and applied.DMARC Policy- An adjudication, based on any policies found inDMARC ResultsandDMARC Results on Base Domain, of the relevant
DMARC policy that applies.DMARC Subdomain Policy- An adjudication, based on any policies
found inDMARC ResultsandDMARC Results on Base Domain, of the
relevant DMARC subdomain policy that applies.DMARC Policy Percentage- The percentage of mail that should be
subjected to theDMARC Policyaccording to theDMARC Results.DMARC Aggregate Report URIs- A list of the DMARC aggregate report
URIs specified by the domain.DMARC Forensic Report URIs- A list of the DMARC forensic report
URIs specified by the domain.DMARC Has Aggregate Report URI- A boolean value that indicates ifDMARC ResultsincludedruaURIs that tell recipients where to
send DMARC aggregate reports.DMARC Has Forensic Report URI- A boolean value that indicates ifDMARC ResultsincludedrufURIs that tell recipients where to
send DMARC forensic reports.DMARC Reporting Address Acceptance Error- A boolean value that is
True if one or more of the domains listed in the aggregate and
forensic report URIs does not indicate that it accepts DMARC reports
from the domain being tested.Everything elseSyntax Errors- A list of syntax errors that were encountered when
analyzing SPF records.Debug Info- A list of any other warnings or errors encountered,
such as DNS failures.  These can be helpful when determining howtrustymailreached its conclusions, and are indispensible for bug
reports.ContributingWe welcome contributions!  Please seeCONTRIBUTING.mdfor
details.LicenseThis project is in the worldwidepublic domain.