Removing old SMTP servers from Mail.app
So you’ve changed ISPs, tested out multiple email hosting services, and have finally settled into a small series of email addresses that you are going to stick with for awhile. Apple’s Mail.app stores all the SMTP servers you’ve used in the past in your preference file and asks what server you want to use for sending email when the default server is unavailable. This is great except for one thing - you’ve got 10 old servers that are useless for sending email still stored in the memories of the software. You’ve long since deleted the old accounts and can’t find discover where these old servers are lurking around. Here are three solutions:
