Blake Hudson wrote:
If 587 becomes popular, spammers will move on and the same ISPs that blocked 25 will follow suit. I don't see this happening as easily. Authenticated means an easier shutdown of an account, rather than some form of port block/etc. An infected machine can just as easily send out mail on port 587 as it can using port 25. It's not hard for bot net hearders to come up with a
J wrote the following on 10/25/2011 9:25 PM: list of valid credentials stolen from email clients, via key loggers, or simply guessed through probability. I see it every day. I will shutdown a compromised account on my end, but that doesn't stop ATT's infected subscriber from spamming 100 other servers using 100 other stolen credentials. I may also send an abuse report to ATT if they have an infected machine trying to perform a dictionary attack or brute force logins against my port 587 SMTP server. ATT's going to deal with the abuse reports as cheaply as possible. If they receive enough, I have no doubt they'll repeat past mistakes.