Gmail app not sending Email with attachments

I have a lot of images I want to send from my phone to an email. I had in the past some error messages about emails being too big, so this time I sent in most emails 3 pics, which all queued in the outbox, and about 3 emails got through after a while. But now I have more than a day 20 emails in the outbox and it seems that nothing is happening. So my questions are: 1. Whats going wrong? 2. Is there anything I can do? (beside sending via BT to a computer, and email from there) I have tried: * Leaving the phone with open Wi-Fi connection all night * Rebooting the phone (and leave another night with Wi-Fi) * Checked at google's documentation and found out that they're limit is 25 MB per mail Random info that might be relevant: 1. All mails are going to the same person with the same subject, and no body - gmail could be blocking them because a misuse is suspected. 2. I can surf the web as usual through the browser. No connection problems. 3. Each image is about 3MB, so each mail has a total of 9 MB. 4. There is exactly one email that has 4 images in it - not the first in the list. 5. First email in the list has only 2 images (both smaller that 2.9 MB) 6. I get notified about new emails I get.