SMTP Question

[Bill.Bowen]

This may be a dumb question but just what is a "SMTP Sending Agent". I've been attempting to block spammers via a policy in the SMTP Server but it seems some can still connect. For example.

With these policies defined,

SMTP Sender ends with .xx
SMTP Recipient ends with .xx

mail.server.xx can still connect.

Do I need to define,

SMTP Sending Agent ends with .xx

to successfully block the spammer?

Thanks.

[adrien]

sending agent is the identifier that the sender uses to identify itself in the first command sent to the server (usually the HELO or EHLO command).

e.g. when our mail server sends you a mail, the first command it sends is

EHLO smtp.qbik.com

so in this case, the "smtp.qbik.com" is the sending agent.

This is different to the domain name of the host that you may see, since forward and reverse DNS lookups don't necessarily match up.

Adrien

[Bill.Bowen]

Thanks for the info. I've got numerous spammer sender and recipient (@example.) domains blocked via the SMTP policy. Is there an easier way to manage these blocks? Like being able to add from a text list? The current interface is very cumbersome when managing a large list. If not, how about considering adding a similar feature in a future release. Even an offline utility would be welcomed. Thanks.