04-09-2010 10:42 AM - edited 03-11-2019 10:31 AM
I'd like to put a rule in place on our ASA that will drop any incoming SMTP traffic that has a FROM address matching our domain. For example, drop any inbound SMTP traffic that has a from address of *@mycompany.com. However, I'm really unsure how to do this. Are there any articles or an overview that someone can point me to?
I'm interested in doing this as I believe it will help drop spoofed email traffic at the edge, before it even hits our antispam device.
Thanks,
Greg
04-09-2010 12:10 PM
Greg,
Check this link. It prevents your email server from being a relay which I think is what your after.
https://packetpros.com/cisco_kb/ASA_Prevent_MailRelay.html
Hope it helps.
04-10-2010 09:01 AM
Hi Collin,
I'm looking more to prevent spam messages getting to my users where the message takes the format FROM Greg@company.com TO greg@company.com as we should not be receiving messages like this inbound. Relaying is already disabled on my mailserver.
Greg
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