antispam settings

Dear experts,

I've installed GFI MailEssential antispam and now I need to configure it.
There is many options turned off by default.

In these cases, I'm not sure wheather leave them disabled or enable it:
Check if the email header contains an empty MIME FROM: field.
Check if the email header contains a malformed MIME FROM: field.
Check if the email headers contain different SMTP TO: and MIME TO: fields.
Verify if sender domain is valid (performs DNS lookup on MIME FROM:)

Can you please recommend?


Regards,
Jarda
LVL 7
Jaroslav LatalMSPAsked:
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John EastonDirectorCommented:
I used GFI MailEssentials for a number of years and generally found the default settings worked quite well.  However, over the years I did make some tweaks based on the spam that was getting through.

Of the four you listed above I would leave them disabled unless you see a lot of spam coming in which meets these rules.  However, I would recommend ensuring SPF checking is enabled (this effectively would cover the fourth point anyway as it would need to look up the SPF record).

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