Email won't send with an attachment

[KBSTORE]

Hi there,

I'm using roundcube email which I got when I set up my website with Moonfruit.
I can send emails, however when I try to send an email with an attachment which is a PDF at 2.7MB it won't send.

I can upload the PDF as an attachment but then when I click send now, nothing happens, it just stays on the same page and won't send.

I tried this again this morning and tried to send it again but got taken to a page which says 'SERVICE CURRENTLY NOT AVAILABLE!Error No. [500]

I need to send several emails with the same PDF attached urgently so any help would be much appreciated.

Many Thanks

B

[SKaero]

If your using your hosts RoundCube install then you need to contact your host for support.