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Postfix SPF mailfrom

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alex smith

I've setup postfix on my VPS Ubuntu 18.04 and I've followed guides to setup DKIM, DMARC and SPF. I have multiple domains on the server and I'm trying to send email from a domain which is not the same as my hostname. (sending via php mail() function)

I have sent an email to Gmail and I've got 3 passes:

       dkim=pass [email protected] header.s=default header.b="xxxxxx/M";
       spf=pass (google.com: domain of [email protected] designates 11.22.33.44 as permitted sender) [email protected];
       dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=second-domain.com

I think Gmail is giving me a pass on SPF because of IP validation.

Checked my email score with mailgenius.com:

(-2 points) Your "from" address does not match your SPF "from" address.
Solution:
Make sure your SPF authentication is setup correctly so your SPF from domain matches the from domain in your emails.

Your From domain is: second-domain.com
Your SPF MailFrom domain is: hostname.com

I don't know where to modify postfix to change the spf mailfrom to match the sender domain and not the hostname? Is it possible to do so?

edit: setting up smtp_generic_maps in main.cf does change those values:

smtp_generic_maps = hash:/etc/postfix/generic

/etc/postfix/generic:

[email protected] second-domain.com

That does change the output and kinda works. That is just hard-coded for one domain.I need to detect which domain is used to replace [email protected]

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anx
Trying to fix up mail after submission is treating symptoms. Instead, configure your mail senders to use the correct addresses. Possibly not [using the php built-ins](https://serverfault.com/questions/917861/sendmail-exim-or-php-mail-settings-to-avoid-sender-address-rejected-domain-n) but instead submit mail like any external MUA would: authenticated submission via SMTP.
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