Last week, i got the complain from my user about her Apple Mail problem. According to her, she can receive new message from mail server but cannot send mail because the Send button on a new message is greyed out and does not respond.
So, i just help her to test her apple mail settings via Connection Doctor. The Connection Doctor can successfully log into the SMTP server.
I just proceed to check the settings of mail to make sure the settings for the mail server are correct. I Choose Preferences from the Mail menu and Click Accounts in the Preferences window. On the Account Preferences, i found that do not have a SMTP selected for that account.
To solve this problem, i just reselect the Outgoing Mail Server (SMTP) and tick the option Use only this server. After that, i create an email and click the Send Button to send out. It is working fine now.
Next time, if you facing the same problem again, please ensure that the “Outgoing Mail Server (SMTP)” pop-up menu is not set to “None”. If it is, select your server from the “Outgoing Mail Server (SMTP)” pop-up menu if it appears.