3rd time in a couple of days, I write down e-mails, attach file and send i over with apparent success. After hour or two, sent e-mail appears as draft and it was never sent. First I thought I was doing something wrong, or maybe forgot to hit send… but twice afterwards, I was sure I did everything alright.

Anyone knows what is the cause of this?

I have found online reference to the older problem where gmail keeps sent and draft emails, but in this case gmail server never sent my e-mail.

I had attached file of 5Mb size. Can this be the cause?