The kanji looks like a person (the cross) standing under a small roof (the top line). This represents 'now' as in 'right here, right now, under this roof.'
'Ima' — Imagine you are 'E-MAILING' someone right NOW. What are you doing 'NOW'? E-MAILING.
'Kon' — like 'COME ON', do it NOW! 'COME ON', don't wait until later!