Email failing to send

latest version of nextcloud installed on Ubuntu 18.04,
using Zimbra as mail server it is fully functional sending and receiving email. BUT nextcloud fails the send test
Using SSL and of course port 443

Email cannot be sent using port 443/tcp which is reserved for https only. If you want to send email you have to use port 25/tcp or 587/tcp (STARTTLS) or 465/tcp (SSL/TLS). You will find detailed information how to set-up email in the administrator guide.

thanks got it going

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It would be nice if you could summarize the root cause of your problem and how you’ve fixed it, so that other users with a similar problem could learn from it too.

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