Sorry, there's no such option at the moment. However we are preparing a new version that will include a "last sent date" for this.
however, if you use the "from" field on the invoices correctly (the email sender), won't that appear on your email's "sent" inbox?

I'm glad to hear about the upcoming "Last Sent Date" feature.
I have just test from my site but there is nothing that comes up in the "Sent" items folder...
To be honest I don't know why it would as there is no mechanism for it...
eg my contact form "Fox Contact" sends email using the email settings in Joomla Global Configuration, Server, Mail settings.... Can Invoice Manager not use the same mechanism? then it comes up in my email (into Inbox BUT at least it comes into my Gmail and I can search through it...).
Many thanks, Kyle.

Yes, IM uses the same mechanism actually. if you use the same email username it will use the same, and it takes all the data from Joomla global config..
os if you use Gmail, and the server is set up with gmail, it should be working...

Hi Germinal, thanks for this. Well it works for INVOICES but NOT for QUOTES...
I've tried this on a few websites which have IM installed...
Am I doing something incorrectly or is this a slight bug in IM?
(I'm using gmail to send from website BUT also in my test to receive.... incidentally whenever I send a quote the recipient receiveds a message saying the email might not be sent from proper sender BUT this doesn't come up when sending Invoices.... do you know what I mean?)
Many thanks, Kyle.

it's a small bug, yes, we have found that and we will include the fix in the next verison (for quotes)

Hi Germinal, thanks for checking that out.
I await updates.
Also any thoughts about a road map for Invoice Manager? Eg features to come or public view of known bugs which will get fixed?
Just think it might stop duplicate forum entries if people can check the roadmap first...
Cheers, Kyle.

That sounds great Germinal thanks.
I'm looking forward to it. Kyle.