Gmail app not sending Email with attachments

Question

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.

Answer 1

I have the same problem, I think also for emails without attachments. The solution is to open the respective email. When I open it (by tapping on it in the Outbox), it gets sent within a few seconds (the caption goes from "Queued" to "Sending" to "Sent" or something like that within seconds).