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Updated SPF how to (markdown)

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Dennis Baaten 2019-06-05 19:48:16 +02:00
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SPF-how-to.md
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@ -41,21 +41,21 @@ The [Postfix SMTP server](http://www.postfix.org/smtpd.8.html) seems to be proce
The follow table provides a schematic overview of an SMTP conversation and relates specific stages to Postfix' access restriction lists. The follow table provides a schematic overview of an SMTP conversation and relates specific stages to Postfix' access restriction lists.
| Part of the SMTP conversation | Associated access restriction list | Comments | Part of the SMTP conversation | Associated Postfix access restriction list | Comments
| --- | --- | --- | | --- | --- | --- |
| Connected to 192.168.1.1 (192.168.1.1). | | | | Connected to 192.168.1.1 (192.168.1.1). | | |
| Escape character is '^]'. | | | | Escape character is '^]'. | | |
| 220 mail.example.com ESMTP Postfix | [smtpd_client_restrictions](http://www.postfix.org/postconf.5.html#smtpd_client_restrictions) | | | 220 mail.example.com ESMTP Postfix | [smtpd_client_restrictions](http://www.postfix.org/postconf.5.html#smtpd_client_restrictions) | |
| HELO mail.example.com | [smtpd_helo_restrictions](http://www.postfix.org/postconf.5.html#smtpd_helo_restrictions) | | | HELO mail.example.com | [smtpd_helo_restrictions](http://www.postfix.org/postconf.5.html#smtpd_helo_restrictions) | |
| 250 mail.example.com | | | | 250 mail.example.com | | |
| MAIL FROM:<sender@example.com> | [smtpd_sender_restrictions](http://www.postfix.org/postconf.5.html#smtpd_sender_restrictions) | RFC5321.MailFrom, Return-Path, Envelope sender, Envelope from --> used by **SPF** | | MAIL FROM:<sender@example.com> | [smtpd_sender_restrictions](http://www.postfix.org/postconf.5.html#smtpd_sender_restrictions) | Aliases: RFC5321.MailFrom, Return-Path, Envelope Sender, Envelope From <br>Used by **SPF** |
| 250 2.1.0 Ok | | | | 250 2.1.0 Ok | | |
| RCPT TO:<recipient@example.com> | [smtpd_recipient_restrictions](http://www.postfix.org/postconf.5.html#smtpd_recipient_restrictions) | | | RCPT TO:<recipient@example.com> | [smtpd_recipient_restrictions](http://www.postfix.org/postconf.5.html#smtpd_recipient_restrictions) | |
| 250 2.1.5 Ok | | | | 250 2.1.5 Ok | | |
| DATA | [smtpd_data_restrictions](http://www.postfix.org/postconf.5.html#smtpd_data_restrictions) | | | | DATA | [smtpd_data_restrictions](http://www.postfix.org/postconf.5.html#smtpd_data_restrictions) | | |
| 354 End data with <CR><LF>.<CR><LF> | | | | 354 End data with <CR><LF>.<CR><LF> | | |
| To:<recipient@example.com> | | header checks | | To:<recipient@example.com> | | header checks |
| From:<sender@example.com> | | RFC5322.From, headar from, message from --> used by DKIM | | From:<sender@example.com> | | Aliases: RFC5322.From, Header From, Message From<br>Used by DKIM |
| Subject: Test message | | | | Subject: Test message | | |
| This is a test message | | body checks | | This is a test message | | body checks |
| . | | | | . | | |
@ -120,4 +120,4 @@ score SPF_HELO_FAIL 5.0
score SPF_HELO_SOFTFAIL 5.0 score SPF_HELO_SOFTFAIL 5.0
``` ```
This means that.... This means that either a soft fail (~all) or a hard fail (-all) policy will result in the e-mail being classified as spam if the IP-address or host is not in the domain's SPF record.