Clunk Werclick wrote: > My apologies for the terse caveat. As I understand it, there are some > external mail services that roaming users may use that forward mail into > your Postfix claiming to be from your domain. Myself I do not use this. > Relations in England talk of this with Blackberry and O2 when using > IPhone but these are far too modern for me to understand. > > Please hope an expert comes along and soon with a fuller answer, but I > think you will be mostly safe with that. If there should be a problem > your sender will no right away in most cases. >
This should only be a real issue with poorly configured clients or poorly written web scripts. Those that use the envelope sender as something besides what is in the >From header will work properly. SASL clients will also bypass the check so "forwarding" from such clients will be a non-issue.
