------------ Original Message ------------
> Date: Thursday, October 02, 2014 10:30:11 -0700
> From: Dan Brawley <[email protected]>
> To: [email protected]
> Subject: [k-9-mail] Re: "failed to send some messages"
>
> Doesn't look like any support/answers are given via this group, so
> what is the point of joining if no one from K9 email replies? K9
> email v5 updated 10/1/14
> Running android 4.4.2
> Unable to send email; failed attempt to send message (something to
> this affect). 
> Steps taken:
> -Cleared outbox from 3 messages that didn't send. Resend/failed in
> a strong 4G area 
> -above steps tried after clearing cache first; sane results 
> -restart phone, pulled SIM card and reseat after a
> minute (Verizon Note 3/Android 4.4.2). Try above re-sending of
> email. Failed... 
> -3 outgoing emails back in outbox. At home and
> back on Wi-Fi. Sent... 
> -turn Wi-Fi back off, at home, enable
> mobile data and sent 3 separate emails and all went through...  
> 1) test email to self
> 2) share email via FireFox
> 3) share email via Chrome

If I am reading things correctly you encountered:

  - 4g cell data-out&about/sending failed
  - wifi-home/sending worked
  - cell data-home/sending worked

This doesn't sound like a direct K-9 issue, rather more likely
network issues or hitting access controls on your outgoing mail
server.

First, being in a "strong 4g area" doesn't necessarily mean that you
have a data connection. I don't use verizon, but know that with both
att and tmobile I can have a seemingly strong signal, but no data. I
use an app like "ping" (and other tools) to test for data when I'm
in doubt.

That sending first didn't work over cell data and then did, points
most likely to some type of network issue, not something specific to
K-9.

If you had had consistent results on a transport-specific (wifi/cell
data) basis, then I would suspect that your home wifi connection is
accepted by your outgoing mail server in a way that differs from
your cell data access, and the latter ran into trouble.

There are other potential scenarios but that would require more
knowledge of your network environment, outgoing server and K-9
outgoing mail configuration.


   - Richard


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