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When I have a poor internet connection, Mac Mail somehow switches into a mode when it no longer can connect to my Exchange email account (no problem with IMAP). In this answer it is suggested that Mail attempts to automatically manage account settings should problems (such as a poor connection) occur, which may it ending up with invalid account settings.

I have now switched this off, but the account is still not working. How can I reset it to the appropriate settings (without deleting and re-instating it – as suggested here – which would re-load ~10000 emails, which I rather avoid)?

I should say that I'm running macOS 10.12.6.

  • What do you mean by "poor"? Is it very slow? Connection drops? A combination? – Allan Dec 21 '18 at 11:34
  • @Allan this doesn't matter really for the question (it was a public Wifi on a bus). The effect was that Mail no longer access the Exchange account (even from a good connection now). I presume it had changed the account settings, but cannot find a way to re-set them. – Walter Dec 21 '18 at 11:36
  • The reason I ask is because Exchange ActiveSync is designed to work with exactly your type of connection. Apple Mail doesn't support this and uses IMAP. Apple Mail actually needs Exchange Web Services to operate properly. The easiest way to reset everything is to delete the account and re-add it because Exchange clients will use an "autodiscover" feature to set all of the server settings. If you want this to work reliably, switch to Outlook – Allan Dec 21 '18 at 11:45

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