Am 26.03.2015 um 11:56 schrieb David Jones:
From: Reindl Harald <h.rei...@thelounge.net>And that is a silent discard. You are accepting responsibility for the email, telling no one anything more and discarding it with out DSN/NDRand everybody acting that way for mails which are not only his own should refrain from maintain a mailserver because he is playing lottery with other peolles communicationI filter for over 100,000 mailboxes with MailScanner so silent discards happen all the time with no issues from our customers. It's going to be different for each environment so it's not a hard rule
the environment don't matter, silent discard of wrong classified mails is harm you are doing to users and not to machines - i was affected by such a behavior because talking about PTR filtering in a mail-thread and some of the hostname domains where on URI blacklists
i tell you waht my reaction as responsible admin was: * a existing and payed service contract until end of 2016 * within 2 weeks day and night replaced and de-commisioned the appliancenot because my personal false positives, just because i can't take responsibility and give customers qualified answers in case of a gambling machine as MX
If you have other protections setup around SA like RBLs to reject, honeypot MXes that tempfail, etc., then SA only has to scan a small percentage of your messages. This equates to a very small percentage of silent discards for obvious spam which keeps you from being part of the backscatter problem. A large percentage of mail that makes it to my SA is clean mail. I do have the occasional false positive but we quarantine everything and can release it as needed. I have never had customer ask to release a message that scored 2x above our block threshold or had a virus so these are definitely safe to silent discard as long as local laws allow it.
"so silent discards happen" and "false positive but we quarantine everything and can release it" at the same time?
yes with RBL scoring, honeypot MX and so on only a very small percentage of mail touchs SA at all - that's why it scales also with a large user number to make the filtering before queue
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