Sometimes, my mail that I send is returned as "undeliverable". Other times it goes through. It happens on a random basis. Any ideas as to what I should do? Thanks.

If an email turns out to be "undeliverable", it means that the address of the recipient has not been indicated correctly or that it does not exist...

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I understand that, but it doesn't happen all the time. If that were the case, none of my emails would be sent.

check your message rules, it happens sometimes when you send to undisclosed recipients and, for example you left a group but forgot to cancel it from your message rules. It happened to me that way but check other things that way as I think I've had the same problem with the contacts, still in undisclosed recipient.
It can also be if there is a temporary problem with the server which sometimes happens with gmail

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Thanks, I'll do that.