Reject mail with specific file extensions

Question

Hi!

I need to reject mail that contains files with special extensions (for example, .exe).
When I put .exe into email protection -> smtp -> antivirus -> file extention filter, UTM begins to quarantine mails with .exe files.
But how can I reject such mails?

Thanks!

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cgi · Answer

Eventhough it's 5 years old: Is there no option? We have a bunch of people still trying to send .xls/doc documents instead of the XML pendants, which are a security risk. Currently the UTMs just quarantine them - I'd like to reject them! 
 The sender doesn't know he's sending 13 years depricated stuff and expects it to be delivered. 
 Any solutions for that?

BAlfson · Answer

Reflecting on this, I came up with a workaround... 
 One could find the quarantined items with: 
 grep 'reason="ext"' /var/log/smtp.log 
 Or, if you wanted to look at the ones from yesterday: 
 zgrep 'reason="ext"' /var/log/smtp/2020/06/*24* 
 An example (personal information obfuscated) I got with that was: 
 2020:06:24-02:20:00 secure smtpd[6228]: SCANNER[6228]: id="1001" severity="info" sys="SecureMail" sub="smtp" name="email quarantined" srcip="140.xxx.yyy.103" from="badguy @criminal.com " to="me@domain .com " subject="QUOTATION" queueid="1eJFxw-0001cS-9h" size="1054608" reason="ext" extra="exe" 
 If the number of such cases is small, a standardized manual email could be sent to the sender pr&eacute;cising the date, time, subject and extension. Easy also to delete the message in the Mail Manager. 
 Cheers - Bob