can receive email but unable to send

Have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?

Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.

NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.

jccartwright wrote:

thanks for the suggestion but I've tried all the steps in If you can't send emails in Mail on Mac.

For problem accounts the go to way to sort things out is to delete the account(s) from the Mail.app, then add it back.

Remove email accounts in Mail on Mac

Remove email accounts in Mail on Mac - Apple Support

Add email accounts in Mail on Mac - Apple Support

Add email accounts in Mail on Mac - Apple Support

Note—

IMAP accounts stay on the server, so no local loss, when you re-sync

POP accounts download and remove from the server—therefor save your inbox/sent box if you want them

“On My Mac" is just that, local folders you created and moved mail into. So no loss

Who's your email provider?

Is mail set up on any other devices (ipad, iphone) and do they work?

Are you on your own usual WiFi/internet or someone elses?

jccartwright wrote:

Tried various accounts, removing/adding account. Able to send email from web-based interfaces but not from Mac Mail. Seemingly correlated to most recent Ventura update. One can hear the sound signal mail being sent but never appears in Sent folder nor received by the recipient. Connection Doctor shows SMTP connections healthy.

See if there is anything here—

If you can't send emails in Mail on Mac