When trying to setup the custom SMTP server with the correct details, “Message could not be sent” error is shown when clicking to test email settings.
I had previously been using an older version of Manager, and was unable to send emails using defaults or the custom SMTP and updated to the latest version as mentioned in the forums for the email issue.
Doing so corrected the initial error message, though did not resolve the problem.
Tested on two Macs both running El Capitan (10.11.13) using the latest Manager (16.3.24). Both fail with the same message.
First Mac was an existing business. Second Mac was a clean install with a business quickly created just to test SMTP connection.
Tested SMTP server in several email clients. Works as expected.
“smtp.zoho.com” 465 (SSL) / 587 (STARTTLS), with login required.
Use SSL is checked, have also tried without. No change.
From address must match the account, have also tried with default no-reply. No difference.
Also tested using Hotmail and Gmail SMTP (including allowing insecure logins for gmail), but still receive the same message.
Emails can be sent when not using a custom SMTP, or when using a custom SMTP that does not use SSL.
Also tested Manager (16.3.24) on Windows and the custom SMTP works correctly as expected.
On the Windows version, the error messages were more specific if incorrect data was entered, as opposed to only “Message could not be sent” on the Mac version.