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Knowledge base Apple Mail (MacOS): problem solving

Apple Mail (MacOS): problem solving

This guide explains the various steps to follow in case of a problem with Apple Mail software (running MacOS).

Initial reflex

The very first thing to do is to follow the instructions for the closest version to yours by clicking here: https://faq.infomaniak.com/1075

To follow step by step

Study the various possible reasons for a configuration failure: https://faq.infomaniak.com/2218
Close Apple Mail completely then re-open it. A message may appear indicating a problem with the certificate. Click Connect and everything should work again
It is important to delete any messages in the outbox in the process of being sent. These will still contain the old settings even if you have modified them in the meantime, so they will never be sent. Delete them, send new messages and they will use the new, correct settings.

If that still does not work...

Go to Mail -> Preferences...
Open the Accounts tab
Select the account concerned in the left column
Open the Advanced tab and untick Use SSL
Return to the Account Information tab
Locate the Outgoing Server drop-down list (SMTP)
Select the last option, Edit the list of servers...
Select the outgoing server to edit (list in the upper part of the window)
Click the Advanced tab
Enable Use the customized port and indicate port 587
Untick Use SSL (Secure Sockets Layer)
Click "OK"
Send yourself an email and it should work without a problem

Otherwise, go to Mail -> Preferences...
Go to the Accounts tab
Select the account concerned in the left column
Under Incoming server precisely indicate mail.infomaniak.com
Locate the Outgoing Server drop-down list (SMTP)
Select the last option, Edit the list of servers...
Select the outgoing server to edit (list in the upper part of the window)
Click the Account Data tab
Under Server Name precisely indicate mail.infomaniak.com
Click the Advanced tab
Enable Use the customized port and indicate port 587
Send yourself an email and it should work without a problem.