> Why do I not get emails from 3 senders when they have attachments, but
> fine
> from all other senders incliuding these 3 without attachments ?
Could really be lots of reasons, but, considering how little info there is
in your post, it's all mostly guesses.
I'm going to guess this is a pop3/imap account and not Exchange and ask:
Does your ISP provide a web based reader for your email and, if they do, do
you see the messages with attachments there?

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f.h.