What would be the simplest way to limit a message size send to an email
address. I was hoping to find something in the access map that would
allow something like a max size of 10MB.

Maybe interesting for others to know
I have an exchange server and when you define a maximum message size of
eg 10MB, and have configured an extra pop account that retrieves email
and stores this in exchange. All messages >10MB will just disappear.
Exchange is not rejecting it, it is just accepting the message and then
deletes it without notification. (Obviously when you report such weird
handling at M$, you get that this is by design)

None wrote:
> What would be the simplest way to limit a message size send to an email
> address. I was hoping to find something in the access map that would
> allow something like a max size of 10MB.

Did you take a look at the fine documentation?

4.14. Maximum Message Size

To avoid overflowing your system with a large
message, the MaxMessageSize option can be set to set
an absolute limit on the size of any one message.

Note: this is enforced on the "incoming" side -- which should work
ok as mail must be submitted to your server before it is send "out".

--
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> 4.14. Maximum Message Size
>
> To avoid overflowing your system with a large
> message, the MaxMessageSize option can be set to set
> an absolute limit on the size of any one message.
>

Yes I have this, for other 'linux' accounts, would like to keep this.
define(`confMAX_MESSAGE_SIZE',`52428800')dnl