Unable to send email

What settings are you using for outbound(SMTP)? 

Also, is it the native email app, or something you downloaded? If so, what?

PS. For future reference, this kind of post would be better in the Internet Forum. The Apps forum is mainly for Cox apps like Cox Connect and Contour.

That was the first thing I checked. The settings are  TLS / 587.

If I change it to  TLS- accept all certificates, save it, exit, open and edit the email in the Outbox and send it, the email will go about half the time.

It is the native app which came with the tablet that I've been using successfully for about a year and a half until this problem started two or three weeks ago.

I think the way it works is 465 is for SSL and 587 is for TLS. Both actual work with SSL, since backwards compatible, but port 587 uses it by default.

When it doesn't work, do you get any error message?

Also, do you have anything else set up for Cox email? Another PC? Another tablet? Are they using the same settings? If so, can they send?

Last, are you having to keep changing the setting to TLS accept all certificates? If so, sounds like a issue with the app saving the settings.

Moderator, could you move to Internet forum?

The error message that appears as the error occurs is "Server unavailable (willingrvw1@cox.net)" and then the email is marked as "failed" in the Outbox. 

Just checked my phone and it has the same settings (TLS/587) and it works fine.   My wife's laptop uses Thunderbird with no problem. 

The workaround is to change it to accept all certificates, exit, come back and switch back to simply TLS and send the one message.   It seems like the first message being sent after the exit/entry/change will go, but the second, or more than one in the Outbox,  will not be sent.

The settings are saved and don't change, unless I change them. 

How do I move this to the Internet forum? 

RalphW said:
"Server unavailable (willingrvw1@cox.net)"

Is that the entire message? It seems to imply the server it is trying to use is willingrvw1@cox.net. If that is the case, then that is the problem. Is it possible you have a extra account set up in the client with the wrong settings? That might explain why it works half the time.

RalphW said:
Just checked my phone and it has the same settings (TLS/587) and it works fine.   My wife's laptop uses Thunderbird with no problem. 

Then that pretty much rules Cox out. What version Android are you running on your phone vs your tablet?

Last, have you tried another email client on the tablet? That would help isolate the issue, and be a possible work around if your fine with the new app. Try Google's Inbox app, or Aqua Mail. There are a ton of free ones out there, so take your pick.

PS. I wasn't asking you to move the post, I was asking the moderator. Not a big deal, because I would probably be answering you over there, but it allows more people to see your post and give input. 

I think the server it  is referring to is the cox server. That's my email address. However, I was able to add that email account to my gmail app and it works there. The Gmail app has worked fine throughout and not a problem. I downloaded a different app and it too seems to work as well. Maybe it is the app that is bad, but it just seems strange that all of a sudden when nothing else has changed and the Cox tech that I talked to said they were aware of problems. Thanks for all your help.