Don't send messages to a list with 'return receipt requested'. Will
cause a bit of traffic towards you when that happens.
Set up SMTP Auth and set all clients to use that on port 587.
If the sender was outside your LAN, you have a bigger problem if you
allow unauthorized relaying through your server.
BTW, there is no mechanism in Surgemail to limit access via MAC
address. And you can only get the MAC address of those on your local
LAN. You won't get the MAC address from any connection outside your LAN.
LCR Computer Services, Inc.
On 09/11/14 22:12, Michael Parker wrote:
> Hello everyone.
> I have a small work group of 15 people all of whom have access to
> mail. Yesterday the logs showed someone used the smtp service to send
> 2000 emails which lowered our senderbase.org score to -100 Poor. The
> logs showed the senders email address and ip address. Neither of which
> belongs to us.
> Now one of our major government client's email system refuses our mail.
> Their tech lead me in the right direction.
> What I want to do is restrict access to smtp services to the work
> group devices only. Is there a way to do it with mac addresses ?
> Best regards,
> Michael Parker
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