1. AC Question's Avatar
    I *am* able to send and receive e-mails from my Gmail account on this phone. I *am* able to receive e-mails from my Yahoo account on this phone. But I *am not able* to send e-mails from my Yahoo account. I have a month-to-month Straight Talk service plan for this Samsung Galaxy S4.

    Yes, I have tried clearing the cache and emptying the data for the Yahoo e-mail account, and uninstalling and reinstalling the Yahoo mail app. None of this helps.

    This is not a problem from my other cell phone with another service provider, so I suspect the problem may be with Straight Talk. Their customer service info was not helpful.
    02-28-2015 12:41 PM
  2. Rukbat's Avatar
    Make sure your Yahoo SMTP account on the phone is set up the same as the SMTP account on Yahoo - type of authentication, address, etc. (Try adding the Yahoo account to whatever other email app you're using too.)

    It has nothing to do with Straight Talk - to them, an email is just more internet data.
    02-28-2015 08:58 PM
  3. shashankmittal's Avatar
    I have the same issue on my Nexus 5 on Straight Talk. I have looked through several solutions on various forums online, but nothing has worked so far. I use the GMail app to connect to gmail, hotmail and yahoo email accounts.

    1. All email accounts work perfectly over WiFi.
    2. Yahoo outbound email DOES NOT work over cellular data. It works over Wifi.
    3. When on cellular data, I get an error from GMail app when sending yahoo emails: Couldn't sign in, username or password is incorrect.
    4. I have tried different apps - BlueMail, K-9, Yahoo email, none of them work...they have give the same error. The only app that allows me to send yahoo email on cellular network is MyMail, but it doesn't allow me to see the settings it uses to connect to yahoo servers.

    In the GMail app, these are my settings:
    Server: android.smtp.mail.yahoo.com
    Port: 465
    Security: SSL/TLS
    Require Sign in - checked.
    Username and password is provided and is correct, since it works over WiFi.

    The fact that yahoo works on WiFi and not on Straight Talk network, indicates that it is a Straight Talk problem.

    Just as a reference for those who understand the technicalities: I have run trace route, ping, SSL scan etc on "android.smtp.mail.yahoo.com" over Straight Talk network from my phone, but I haven't noticed any problems yet.
    04-27-2015 09:07 AM

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