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550 [PERMFAIL] XXXX.com requires valid sender domain: on a few ocations I am receiving an error message as follows 550 [PERMFAIL] xxxxxxxx.com requires valid sender domainwhat exactley is this saying?I'm sending from xxxxxxx@comcast.net, is comcast.net not a valid sender domain?Mail errorA few things may cause this. Verify that your email client's configuration for send and receive...; Tags: E-mail, TDWay, valid sender domain, sender domain; Discussion threads 2007-08-09

Cisco IOS Command Chart (IOS v.12+): Becoming proficient with Cisco equipment means remembering a whole new set of commands. These command charts give you a quick way to look up the needed IOS commands and switches when you need them.; Buy Now

Windows XP vs. Mac OS X: This presentation, entitled Standardizing on Windows XP Instead of MAC OS X, provides a pre-packaged option for defending Windows XP against MAC OS X. ...; Buy Now