Emails from the site to you are soft bouncing. If they soft bounce too many times, it stops sending mail. The site should give you this notice:
It wants you to enter a new email, but if you keep your same email, the cycle continues.
If they're going to your spam folder, is there a way to flag them as not spam? Or whitelist xs650.com? This could be from too many people marking emails as spam instead of unsubscribing.
Here's the bounced email error:
SMTP error from remote mail server after end of data:
554-5.7.1 Message rejected due to possible spam content
554 [65B24C6A-AE383021@mta2304]
This is something your ISP is doing because they don't like the content in our notification emails. I don't have much control over it. The only thing I can think for you to do would be to add
admin@xs650.com (all email from xs650.com if possible) to your contacts, then contact your email provider to see if they can stop flagging mail from this site.
XS650.com and its IP address are not currently on any mail blacklists:
https://mxtoolbox.com/SuperTool.aspx?action=blacklist:xs650.com&run=toolpage
The email server seems to be set up correctly with SPF, DKIM, and REVERSE DNS (PTR) records.
The bounce logs only show a handful of bounces over the last couple of weeks. They seem to be to email addresses like westnet.com.au, bigpond.com, iinet.net.au, bigpond.net.au, and similar domains. Perhaps they all use the same system. I'll do a little digging and see if I can contact someone to get xs650.com whitelisted.
The majority of users here use yahoo, gmail, hotmail, live, comcast, etc. and those all seem to be getting through without issue right now.