Mail (Yosemite): Verify an account’s outgoing mail server
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Choose Mail > Preferences, then click Accounts.
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Select an account.
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Click Account Information, then review the server being used for outgoing messages.
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If None is selected, click the Outgoing Mail Server pop-up menu, then choose a different server.
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Make sure the selected server is one specified by your account provider and that the server name is spelled correctly. Click the Outgoing Mail Server pop-up menu, choose Edit SMTP Server List, then review or enter information as directed by your provider.
If you contact your provider about the server, use the form in this Apple Support article to record Mail settings you might need for configuring the server.
Apple Support article: Mail settings you might need from your email provider
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If the server is obsolete, click the Outgoing Mail Server pop-up menu, choose Edit SMTP Server List, select the server, then click Remove
. Don’t remove a server that’s in use by an account unless you’re ready to add a different server for the account.
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Test your changes by sending yourself a message.
If you use your Mac on a different network, such as at a coffee shop, your usual mail server might not accept and send your messages. Deselect “Use only this server” in the Account Information pane in Mail preferences to have Mail use any available server.
When you choose a different server for an account, all messages you send from the account use that server until the network status changes. The status can change when you move from one network to another (say, from work to home), or if your Mac goes to sleep and wakes up in a different network environment.