> On 12 Jul 2017, at 10.36, [email protected] wrote:
> 
> Backends don't have access to user database and i wanted to keep it like this 
> :(

Then probably your only possibility is to update last_login information with 
the authentication
policy framework introduced in dovecot 2.2.25: 
https://wiki2.dovecot.org/Authentication/Policy

just build your custom auth policy server that updates last_login information 
after successfull
passdb authentication

Sami

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