MikroTik

I am using HotSpot and smtp-server option to redirect all trafic to my local ISPs SMTP server...

This works grate when client use SMTP without authentication. When client use authentication for SMTP then my local ISPs SMTP server return (unknow user or simmilar and mail will not be sent)

How its possible to bypass firewall redirect roule if SMTP client use authentication and send smtp trafic to clients smtp server? Script, address-list?

Thanks.

Hi,
as most of those hotspot clients have their mail account properly configured (server and authentication defined), I'd recommend to leave those smtp connections masked as all other traffic.
To do so, just create a rule in NAT, using chain 'hs-smtp' and in the action specify 'accept'. Remember to rise this rule BEFORE the other Dynamic 'hs-smtp' chain.

Hi,
but this its like removing SMTP server from hotspot setup. No traffic will be redirected to my local ISP smtp server and all clients with mail software configured to send mail using smtp server from other ISPs without authentification will not be able to send e-mails.

it is possible to distinguish smtp trafic with autentication from smtp trafic without autentification?

Thanks.