Emails with pictures not sent with not very informative error message

[xandro0777]

Checklist

• [X] I have used the search function to see if someone else has already submitted the same bug report.
• [X] I will describe the problem with as much detail as possible.

App version

6.801

Where did you get the app from?

F-Droid

Android version

13

Device model

Realme

Steps to reproduce

Compose Email with some images, even moderate size like 2x130kb. Images usually compressed with imagepipe or similar.

Sender and receiver both Gmail.

After a while I see the notification "Failed to send some messages/unable to send message" and the message is stuck in outbox.

Trying to resend it many times will never fix the problem. Network is better than enough. Sometimes moving to drafts, re-editing and re-sending helps. Most of the time I have to remove the attachments and then it works immediately.

Error message is not informative but best guess the Gmail server considers the email malformed or illegal?

Expected behavior

Send message or provide detailed error message.

Actual behavior

Doesn't send with poor error message.

Logs

Have enabled debug logging but was not asked where to save the logs and don't see export logs option ... willing to retry of course

[scfarley]

I ran across this recently. When I was attempting to send it (and resend it), I saw no network traffic with tcpdump from my phone to my mail server. However, the workaround to move the E-mail to draft then resend worked.

• App version 6.803

• Where did you get the app from? F-Droid

• Android version 14

• Device model Google Pixel

[dionysius]

Wrote a mail with 3 images as attachment, roughly 3MB each. Thunderbird is unable to send this mail, I only get:

• Thunderbird is unable to resend this mail, same error as above
• ~~There is no option to delete mails in outbox~~ Longpress delete
• Nothing happens if I try to move the mail to draft

~~So I'm unable to resolve this reaccuring error. I'm fine with deleting this mail, but there's no such option.~~

Mail is also in "Sent Mail" folder, maybe it did send? (gmail account)

All other mails even on the same account are sending fine.

Android 15, HyperOs stock, Thunderbird 10.1, Play Store.

k9mail-logs.txt