it is nice that you have shared this.
however, that info has been posted here many times and I believe in the userguide.
also, the reason that most of us suggest that you not use smtp even if you have a gmail or other type account is because many , if not most, hosts do not allow you to relay email from other hosts like gmail through their servers.
If you notice in the link you posted, your host says they do not allow smtp relaying without requesting a special setup from the host.
Many hosts do not allow it at all.
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