Hello, every day I receive a message from my permiter firewall with an attempt by 18.104.22.168 (mxsrv1.spamgateway.comodo.com) to send an SMTP DATA parameter with a very high value (Data Size (> 52428800) however there is no email in my incoming queue. Is this a check that Comodo do to test the maximum message submission size? Just wondering what the nature of this check is as I would like to understand if it’s normal before I tell me firewall to chill out.
– Full Message from Cisco IOS F/W –
Jul 18 09:02:05.994: %FW-3-SMTP_UNSUPPORTED_PARAMETER: Unsupported SMTP parameter (Data Size (> 52428800)) from initiator (22.214.171.124:38019)