Of course there is. The MX's I run monitor all activity and if some jerk sends me 20 attempts of 5 Mb each, he's on the radar and the ip gets blocked. If I "RFC-correctly" allow him to send one 100 Mb msg just so I can have the polite opportunity to 5xx him, the abuse count is under the radar.In the case of an attack he would use the SMTP HELO protocol so he wouldn't need to send size. In that case he would just retry wherever the message was cut off at either 10 or 100 MB, so no difference there either.
Eating 100 Mb incoming msgs that are 95 Mb bigger than I allow just because it's required by RFC is plain silly and unreasonable. I'm sure every major ISP has similar tactics in place, and Internet is not suffering from it.
The kind of RFC "violation" I'm talking about doesn't break anybody else's mail server or screw up Internet. Call it a "compassionate violation", where the object of the compassion is my own MX. :))
You guys sound like Internet mail is some kind of tea-party-on-the-croquet-lawn. :))
BOFH rules apply at at times. (and we make them up unilaterally as we go along, depending on the attacks).
BTW, you RFC-huggers would love IMGate/postfix's new Sender Address Verification, that rejects mail from a [EMAIL PROTECTED] that, in real-time during the SMTP session, won't accept bounces. HUGE amounts of crap blocked.
Len
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