On 2011-06-13 at 00:32 +0000, Michael Jimenez wrote: > So I've been looking at my mail server mainlog for the past couple of days > watching mail come in and out, I've noticed that this Microsoft address keeps > failing to verify:
You're using sender *callout* verification to systems not under your administrative control. This is regarded by many as abusive, and will get you placed on various blacklists. The larger providers have rate-limits and other DoS filters; so when an MSN address is spoofed and you keep hitting their mail-servers with checks on mails they didn't send, you'll exceed ratelimits and get fast-failed: they're rejecting you attempting to deliver to them, which you're interpreting to mean that the address is invalid. Sender callouts are best suited for use to systems under your own control. -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
