Depends. You can attach as many files to mail as you wish. Nothing in principle that wouldn't let you attach 100 pics.
But email providers (both yours and that of the senders) pose a maximum to the size of a mail. It's better to not make a mail bigger than 5 MB to be on the safe side.
So to include 100 pics downgrade or downsize each one to a filesize of 50 KB.
The alternative would be to use some file-sharing services (like Windows Live Spaces or Google docs). You put your files into such a sharing site, give access to your friends and families and them download what they want.
Or burn them to CD and use snail-mail.
I want to send like 100 photos to friends and family overseas and don't want to send a few each email.
Is there a way to send one email with a lump of pics, instead of like 20 emails?
Thanks in advance,