You can set:

g_smtp_portauth "587,465"

g_smtp_portforce "true"


ChrisP.



On 21/02/2023 1:03 pm, Lyle Giese wrote:
> I am running a smart host using the community edition of Surgemail. No 
> mailboxes.  Simply forwarding inbound and outbound email from my 
> servers at home(registered Surgemail servers).
>
> I am getting a lot of Auth attempts via port 25:
>
> 2023-02-20 00:09:24.80:2993407744: 535 Login not permitted domain does 
> not exist (payroll@70.35.205.71) (70.35.205.71) 185.254.37.70
> 2023-02-20 00:22:00.18:2996049664: 535 Login not permitted domain does 
> not exist (production@70.35.205.71) (70.35.205.71) 185.254.37.70
> 2023-02-20 00:34:35.46:2993407744: 535 Login not permitted domain does 
> not exist (program@70.35.205.71) (70.35.205.71) 185.254.37.70
> 2023-02-20 00:47:09.81:2996049664: 535 Login not permitted domain does 
> not exist (rafael@70.35.205.71) (70.35.205.71) 185.254.37.70
> 2023-02-20 00:59:45.80:2994464512: 535 Login not permitted domain does 
> not exist (reception@70.35.205.71) (70.35.205.71) 185.254.37.70
> 2023-02-20 01:12:31.39:2994464512: 535 Login not permitted domain does 
> not exist (remote@70.35.205.71) (70.35.205.71) 185.254.37.70
>
> I did verify the connects are via port 25.  I use a different port 
> with auth enabled for outbound email from my servers.
>
> Is there a way to disallow auth attempts on port 25? If someone tries 
> to authenicate on port 25, drop them.
>
> Thanks,
> Lyle Giese
>
>