Mail.app: Cannot send mail, fixes (#2)

We continue to report on an issue where Mail.app can suddenly and inexplicably fail to send e-mail through SMTP (outgoing) servers. We previously outlined a number of fixes for this issue, including Deletion of the outbox folder and caches, switching of the SMTP port and more. We've now identified a couple more fixes:

Check SMTP server Contact your ISP or e-mail service and ask for the current, correct SMTP server. In some cases, old SMTP servers become deprecated, or no longer function properly.

MacFixIt reader Nathalie provides a case example:

"For several days I was unable to send email from earthlink account. I had been sending email using smtpauth.earthlink.net but after changing all sorts of things, such as port etc., I changed to smtp.earthlink.net and that worked."

Check recipient list Unknown recipients can cause mail sending to fail. Make sure that there are no spelling errors, and that all e-mail addresses being sent to are existent.

For more fixes, see the original article.

Feedback? Late-breakers@macfixit.com.

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