I set up a server with Postfix SMTP auth through Dovecot SASL. However, it was not possible to get the PAM authentification working as standard out of the box.
So more by chance, I changed it to the shadow driver as explained in Dovecot documentation and the configuration and setup runs fine immediately.
Are there any drawbacks keeping the
/etc/shadow as password database in Dovecot's config? Especially, does it impact Postfix/Dovecot/Servers's security anyhow? The documentation just says, "PAM is usually preferred" but does not explain further why.