Can't send mail on Mac book

I suddenly (without makng any changes to my computer or settings) can't send emails from any of my accounts on mac mail. I have looked through various discussions and can't find anything helfpful. Can anyone help?? I am using OS X Lion 10.7.5. Please help!!

Hey HVH67,
Welcome to Apple Support Communities! While you may not have found your exact situation, the general troubleshooting steps for email might help resolve the issue. Take a look at the following article, go through the steps, and see if that helps:
OS X Mail: Troubleshooting sending and receiving email messages
http://support.apple.com/kb/ts3276
Sincerely,
David

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Hello, sounds like you haven't switched to iCloud yet, the old dot Mac & MobileMe servers are going away or gone for most already.
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cognitioncoach wrote:
I have had BT broadband for a year now and recently I have had issues sending mail from mac mail on my business email. It comes back with an error saying to check that email is addressed properly and check smtp settings with admin.
This problem has only just started.
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Any suggestions?
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Steve
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All three laptops have been working with out fault for the last four years and just before christmas they all stopped being able to send emails using hotmail. Obviously BT have changed something somewhere along the line.
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Hi guys,
Wondered if anyone out there can shed some light on this little problem.
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it may be that your server (internet provider) has just started blocking outgoing mails not authenticated by them.
Go to your account set up...
and fill in the following details.
SMTP SERVER: smtp.mac.com
then click on advanced sending otions...
click on override default SMTP port... type 587
click on SMTP servber requires authentication...
use same setting as receiving mail server.
try this...

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Hello everyone--
I can receive mail from my .mac account and have done extensive troubleshooting including:
1. Changing ports from 25 to 587
2. Deleting and re-installing mailbox
3. Reading a hosts of topics
4. I have the serving settings with SSL unchecked
...but this still giving me the same trouble. I cannot send out because my email address keeps getting rejected.
Any suggestions? Thanks!

Are you also accessing an email account and SMTP server in Mail that is provided by your ISP used for connecting to the internet?
If so, can you send mail with this account and SMTP server?
If the answer is yes to both questions, select/use your ISP's SMTP server to send mail with your .Mac account which is invisible to all recipients.
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Changing the Port for the SMTP server that is outside of the ISP's network from 25 to 587 usually resolves it but sometimes not depending on the ISP's restriction.
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I found a work around that works. Got to Settings...Icloud....account......advanced....outgoing mail server.....
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Host Name p01-smtp.mail.me.com
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Can't send mail on Mac book

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