problems sending mail

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Hi all, I have 2 ppcs that have problems. the first is a hp4150. Problem with this one is that I can send and receive mail but when I try to create a new a/c an try to send an e-mail a message comes up saying 'system administrator (this message is on the FROM line) - invalid message recipients' (on the subject line) The following recipients are invalid......then has the e-mail address I was trying to send to (in the text area). This ppc
has an old version of skype installed that I use and hope isn't the cause
as I don't think the newer versions of skype will work on this model.
The other software I have installed that may be causing the problem
is Navman software but I use frequently.
The other ppc is a hp4700 the problem with this one is that I can't send any emails at all (receiving is ok). Thought it may have been my router so went to a mates home and tested it there but the same problems occur.
Does anyone have any ideas as to the problem. I know the hp4700 has worked in the past because it used to belong a friend who sold to it to me when he upgraded. The only thing I've added is tom tom. The 2nd problem with the hp4700 is that I can't install 'skype' on it. Message says something like 'not a windows or Microsoft application.' What really weird is that when my friend owned it he had skype installed and it worked fine. Tried to locate an old version of skype to see if it would make any difference but all the versions I've seen are current.
I'd really appreciate some help if anyone knows what the problems could be.


Thanks
--
Des
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