Mac Mail won't send messages through some accounts

For many weeks I've had to use gmail because Mac mail won't let me go through either my business server or my personal website. I can send if I just use the browser so I know they are working. I've tried various addresses for my out going mail- nothing. I've gone into preferences and disabled those accounts, quit mail, then reenabled them again- still nothing.
My secretary is having the same problem on her Mac mini. Any suggestions?

I've encountered this issue too and I believe it may be an ISP issue. When I set up a new internet provider at my home I was at first unable to send business mail from home. Eventually I solved the problem by calling the ISP and they either made an adjustment or had me change some obscure setting on my computer or modem (it's been so long I can't remember exactly what it was). I still sometimes run into this problem when I take my laptop elsewhere. One way to check and see if this is the issue for you (if you have a laptop) is to take your computer to a coffee shop or some other place with wifi and see if you can send out mail using your business address from there. You also might want to check and see whether you are able to send mail to other addresses within your organization, or whether the inability to send email is across the board. I mention that because I seem to remember that I ran into an issue of some servers being unwilling to forward email that comes from outside to another address that is outside. So if you try to send an email from home, using your business address, to an address outside of your business, it may reject it, while accepting an address within the business.
Hope this helps and please bear in mind that I'm no expert at all.

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Hello, mrselisec.
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Hello, all!
So I am new to Mac and having a tiny bit of trouble with Mail. I can receive messages, Connection Doctor says the server is fine, but nothing goes out. I called my ISP as it is their e-mail but I can log into the webmail and send/receive from Outlook when forced to. I guess that proves it isn't the server.
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For some reason emails have stopped sending. I'm getting an error message below:
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Mac Mail won't send messages through some accounts

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