Can’t send email

Mac|Life - - ASK -

Since up­grad­ing to High Sierra, I’ve been un­able to send mes­sages from Mail to any ac­count apart from Mail re­ports that “try­ing to log into this SMTP ac­count failed,” al­though ev­ery­thing is set as it was in Sierra.

This is an old prob­lem that hap­pens when an up­date cor­rupts Mail’s list of SMTP servers. To fix it, you’ll need a copy of the cor­rect de­tails for each of the ser­vices you want to use, be­cause you need to delete ex­ist­ing en­tries and then make new ones.

Open Mail’s pref­er­ences and click the Ac­counts item, se­lect an ac­count on the left, then click the Server Set­tings tab. This dis­plays a sin­gle pop-up menu, with that ac­count’s out­go­ing mail server listed.

Click that menu, and se­lect Edit SMTP Server List at the bot­tom. Se­lect each of the SMTP servers in the list at the top in turn, and click the – (mi­nus) but­ton to delete each one un­til the list is empty.

Now click the + but­ton to add back each of your SMTP servers one at a time, us­ing the de­tails you recorded. Then click OK, and step through each of your ac­counts in turn, set­ting its SMTP server from your new list.

Fi­nally, quit Mail, just to en­sure ev­ery­thing is saved cor­rectly. When you open Mail again, you should find that send­ing mes­sages works nor­mally again.

If Mail stops send­ing to SMTP servers that seem to be prop­erly con­fig­ured, delete them all and add them afresh.

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