Overthelastmonth, ourdynamic IPaddressisbeingblockedbyanumberofsites...Proofpoint/Sorbsbeingone. Duetothis, ComcastMailerDaemonmessagesarereturnedimmediatelyforvariousemailaddressestowhichwearetryingtosendthroughourWindowsOutlookemailapp. TheseareprimarilyCenturyLInklinkedaddresses, i.e. centurylink.com, embarqmail.com, etc. Wecanreceivefromalladdresses, andwecansendtoalladdressesthroughComcastMail, aswell. OurITconsultanturgedustocontactComcasttoaskthemtoforceachangetotheIP addressafterfinding, aswehad, thatitisnotansmtpportissue, butmultiplesessionswiththeirtechsupporthavebroughttheanswer 'wecan'tdothat'. Wehavealso triedthevariousmethodssuggestedonthewebforchangeattemptsfromourside, alltonoavail, as the site 'myipaddress' confirms. Doesanyonehaveanyothersuggestions?
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