I have had trouble sending e-mails intermittently for about 6 months. I use Apple's Mail app, and have 2 accounts - iCloud and gmail. Occasionally, I get the e-mail with a drop-down menu saying the e-mail did not go through and giving me the option to try a different server or to try later. It appears that Mail is trying to send from the GMail server. How can I fix this, and also make iCloud the server to send from vs. the GMail server?
Thanks in advance for your help.
Since you are syncing with iCloud why don't you try to delete the Gmail account and try to send your mac mail. If mail goes through okay once the Gmail is gone then you can add Gmail back and all of your mail will also come back. See if that works for you.