Unable to set up web mail on iphone

My domain example.sg is the main domain of a VPS. It is also with Cloudflare Pro account.

The other addon domains are with Cloudflare free & I can set up their web mails on iphone (except still having issue with outgoing mails).

I cannot set up web mails for the main domain in Iphone. Error is Cannot Connect Using SSL.
This is the DNS records for the main domain in Cloudflare:

Plse advise anything done with the records.

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