Outlook | Windows | Classic Outlook for Windows | For home
Using Classic Outlook on Windows for personal email, calendar, and contact management
I apologize, but I don't have another idea. Perhaps someone else will. Sorry.
email will not send
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WL
0
Reputation points
email will not send from outlook classic. Account is an IMAP/SMTP account that receives all email but will not send.
Outlook | Windows | Classic Outlook for Windows | For home
5 answers
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(185.6, 62%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBT%3C/text%3E%3C/svg%3E)
Brian Tillman 25,555 Reputation points Independent Advisor2026-04-21T13:57:37.8666667+00:00 -
Brian Tillman 25,555 Reputation points Independent Advisor
2026-04-20T22:48:10.4466667+00:00 That's the incoming email server name. The outgoing server name should be smtp.mail.yahoo.com with port 465 or 587 and SSL/TLS encryption. No wonder your mail doesn't send.
https://help.yahoo.com/kb/SLN4075.html
You should also be able to use smtp.mail.att.net
https://www.att.com/support/article/email-support/KM1010523/
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WL 0 Reputation points
2026-04-21T05:25:48.64+00:00 Brian,
I apologize, I switched them on my reply. I am using the settings on your link. I have tried the att.net suffix and outlook changes it to the yahoo.com suffix. Other email accounts in outlook send immediately. Encryption is SSL/TLS. I do not require SPA but have requires authentication checked.
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Hornblower409 9,670 Reputation points2026-04-21T05:39:06.2866667+00:00 @WL said
I do not have a current error message but the emails are usually just sitting in the outbox.
Anything in your Sync Issues?
See this FSU Support doc for details. (The URL is misnamed. It is actually a link to "What do I need to know about synchronization issues folders in Outlook?")
[External Non-Microsoft Site] https://servicecenter.fsu.edu/s/article/What-do-I-need-to-know-about-the-authentication-certificate-used-for-FSUSecure-and-eduroam-1600352706829
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Brian Tillman 25,555 Reputation points Independent Advisor
2026-04-19T02:01:02.68+00:00 Do you have two-factor authentication enabled for the mailbox? If you open the progress report under Send/Receive>Show Progress, what does it show? Did you configure the IMAP account automatically or manually? What server name, port and encryption is configured for the outgoing server?
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WL 0 Reputation points
2026-04-20T03:45:25.1533333+00:00 I don't see a two factor option and am using an ATT pass key. The progress report shows sending completed but there is still mail in the out box. It spends a considerable amount of time synchronizing subscribed folders. IMAP setting were done manually. Outgoing server - imap.mail.yahoo.com (if I change to att.net it changes back) Port 993 Encryption method SSL/TLS Require logon using Secure Passwor Authentication (SPA) checked.
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WL 0 Reputation points
2026-04-19T01:24:18.2033333+00:00 bRIAN,
I do not have a current error message but the emails are usually just sitting in the outbox. The address with the problem is an att.net provider or yahoo. I have tried to repair the account through outlook and it will then sometimes work once.
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Hornblower409 9,670 Reputation points
2026-04-21T18:24:22.6533333+00:00 @WL said
The address with the problem is an att.net provider or yahoo. I have tried to repair the account through outlook and it will then sometimes work once. IMAP setting were done manually. Outgoing server - imap.mail.yahoo.com (if I change to att.net it changes back)
Not sure about the "it changes back" part. But let's try doing the Server Settings from the Control Panel Mail app instead of in Outlook directly and see if it "sticks".
See the "Edit a profile with the Mail applet in Control Panel" section of
https://support.microsoft.com/en-us/office/overview-of-outlook-email-profiles-9073a8ac-c3d6-421d-b5b9-fcedff7642fcOnce you have he Mail Setup dialog open, choose [Email accounts ...], select your IMAP account and [Change]. You should get the full account setup dialog like this:
Set your Servers and click [More Settings ...] and select the | Advanced | tab. Should look like this:
Fill it in with you specific settings and then [OK]. Back on the Change Account dialog click [Next]. This should trigger a Test Account Settings where Outlook tries to connect to your IMAP server and send a test email using your SMTP sever. Does it complete OK? If not, please reply with a screen shot of your Test
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Brian Tillman 25,555 Reputation points Independent Advisor
2026-04-18T22:52:08.02+00:00 Hi. I'm Brian and I'll try to help.
When you try to send, do you get any error message? If so, please include it here exactly as it appears on your screen, but be sure to mask any real address that appears. Who is your mail provider? If you log into the mailbox with a web browser, can you send messages?