Quote:
Originally Posted by xyzzy
since my "public" email account is a forwarding service ...
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This working well depends on the receiving mail system. Many systems make forwarding unreliable with DMARC. Forwarding can make SpamAssassin less effective unless it's been configured to parse Received headers across each forwarding service. I don't know what the current situation is, but Fastmail has in the past put a lot of effort into making it work.
The problem is that Fastmail may decide to stop bothering, or even implement DMARC rejection, or you might have another reason to leave. At that point you may struggle to find a good replacement.
There's also the possibility that the organization providing the portable address discontinues the service, outsources it to Yahoo or replaces it with their own webmail.
IIWY I'd get a domain and forward it to Fastmail while you phase-out the portable address gradually.