TS3276 I can receive emails, but I cannot send emails. This just started happening. I have an iPhone and I can send emails from my phone fine. It's just not working on my Macbook. Every time I try to send an email it goes straight to my outbox. Can anyone

I can receive emails, but I cannot send emails. This just started happening. I have an iPhone and I can send emails from my phone fine. It's just not working on my Macbook. Every time I try to send an email it goes straight to my outbox. Can anyone help?

Thank you for heading me in the right direction.  I reset my Mail account for Outgoing Mail Server to outbound.att.net:(customer ID)@att.net (instead of smtp.att.yahoo.com, per Apple's online troubleshooting information).   I'm not sure what "(Offline)" means when it appears at the end of my Outgoing Mail Server (SMTP)??  In the Advanced box I clicked on "Use custom port:  465" and checked "Use Secure Sockets Layer."  Authentication:  Password; I have correct User Name and Password put in.  After doing all this, when I try to send emails again today, they go directly to the Outbox and sit there. 
What's curious is that my first sent email this morning did go out using the Outgoing Mail Server, smtp.att.yahoo.com: (customer ID)@att.net(Offline) but subsequent emails I tried to send with this server were rejected with the message:  "Cannot send message using the server smtp.att.yahoo.com (etc.).  The SMTP server doesn't support TLS(SSL) on port 587.  Verify your account settings and try again."  That's when I tried resetting my Outgoing Mail Server to outbound.att.net (etc.), as mentioned above, and was unsuccessful in sending out any further emails.  I guess my next step is to contact my email service provider, AT&T, and see if they can help me.  Thanks, again, for taking the time to respond and for giving me your input!  Much appreciated!

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