Hi,

Great Howto, thank you very much for your work.

Just a comment: you don't need to set sql parameters and mysql as auxprop_plugin in /etc/postfix/sasl/smtpd.conf as you intend to use PAM for authentication.

The following /etc/postfix/sasl/smtpd.conf should suffice:

pwcheck_method: saslauthd
mech_list: plain login
allow_plaintext: true

This way, plain PAM will be used, with the options you set in /etc/pam.d/smtpd. Indeed, you don't even need to install libsasl2-modules-sql package (but you still do need libpam-mysql, of course).

Best regards,

Alberto Caso
Adaptia